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Ameren Illinois Co (AILIM) SEC Filing 10-K Annual report for the fiscal year ending Thursday, December 31, 2015

Ameren Illinois Co

CIK: 18654 Ticker: AILIM
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2015
Jan. 29, 2016
Jun. 30, 2015
Document Type10-K  
Amendment Flagfalse  
Document Period End DateDec. 31, 2015  
Document Fiscal Year Focus2015  
Document Fiscal Period FocusFY  
Trading SymbolAEE  
Entity Registrant NameAMEREN CORP  
Entity Central Index Key0001002910  
Current Fiscal Year End Date--12-31  
Entity Filer CategoryLarge Accelerated Filer  
Entity Common Stock, Shares Outstanding 242,634,798 
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Public Float  $ 9,142,479,189
Entity Well-known Seasoned IssuerYes  
Union Electric Company   
Document Type10-K  
Amendment Flagfalse  
Document Period End DateDec. 31, 2015  
Document Fiscal Year Focus2015  
Document Fiscal Period FocusFY  
Trading SymbolAEE  
Entity Registrant NameUNION ELECTRIC CO  
Entity Central Index Key0000100826  
Current Fiscal Year End Date--12-31  
Entity Filer CategoryNon-accelerated Filer  
Entity Common Stock, Shares Outstanding 102,123,834 
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Well-known Seasoned IssuerNo  
Ameren Illinois Company   
Document Type10-K  
Amendment Flagfalse  
Document Period End DateDec. 31, 2015  
Document Fiscal Year Focus2015  
Document Fiscal Period FocusFY  
Trading SymbolAEE  
Entity Registrant NameAmeren Illinois Co  
Entity Central Index Key0000018654  
Current Fiscal Year End Date--12-31  
Entity Filer CategoryNon-accelerated Filer  
Entity Common Stock, Shares Outstanding 25,452,373 
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Well-known Seasoned IssuerYes  

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Financial Statements, Disclosures and Schedules

Inside this 10-K Annual Report

Document And Entity Information
Consolidated Balance Sheet
Consolidated Balance Sheet (parenthetical)
Consolidated Statement Of Cash Flows
Consolidated Statement Of Cash Flows (parenthetical)
Consolidated Statement Of Comprehensive Income
Consolidated Statement Of Comprehensive Income (parenthetical)
Consolidated Statement Of Income (loss)
Consolidated Statement Of Income (loss) (parenthetical)
Consolidated Statement Of Stockholders' Equity
Callaway Energy Center
Callaway Energy Center (details)
Commitments And Contingencies
Commitments And Contingencies (asbestos-related Litigation And Tax Exemptions And Credits) (details)
Commitments And Contingencies (callaway Nuclear Energy Center) (details)
Commitments And Contingencies (environmental Matters) (details)
Commitments And Contingencies (pumped-storage Hydroelectric Facility Breach) (details)
Commitments And Contingencies (schedule Of Estimated Purchased Power Commitments) (details)
Commitments And Contingencies (schedule Of Lease Obligations) (details)
Commitments And Contingencies (tables)
Derivative Financial Instruments
Derivative Financial Instruments (derivative Instruments Carrying Value) (details)
Derivative Financial Instruments (derivative Instruments With Credit Risk-related Contingent Features) (details)
Derivative Financial Instruments (open Gross Derivative Volumes By Commodity Type) (details)
Derivative Financial Instruments (tables)
Derivative Financial Instruments Derivative Financial Instruments (offsetting Derivative Assets And Liabilities) (details)
Divestiture Transactions And Discontinued Operations
Divestiture Transactions And Discontinued Operations (components Of Assets And Liabilities On Consolidated Balance Sheet) (details)
Divestiture Transactions And Discontinued Operations (components Of Discontinued Operations In Consolidated Statement Of Income) (details)
Divestiture Transactions And Discontinued Operations (narrative) (details)
Divestiture Transactions And Discontinued Operations (tables)
Fair Value Measurements
Fair Value Measurements (schedule Of Carrying Amounts And Estimated Fair Values Of Long-term Debt And Preferred Stock) (details)
Fair Value Measurements (schedule Of Changes In The Fair Value Of Financial Assets And Liabilities Classified As Level 3 In The Fair Value Hierarchy) (details)
Fair Value Measurements (schedule Of Fair Value Hierarchy Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (details)
Fair Value Measurements (schedule Of Valuation Process And Unobservable Inputs) (details)
Fair Value Measurements (tables)
Income Taxes
Income Taxes (narrative) (details)
Income Taxes (reconciliation Of The Change In The Liability For Interest On Unrecognized Tax Benefits) (details)
Income Taxes (schedule Of Changes To Unrecognized Tax Benefits And Related Interest) (details)
Income Taxes (schedule Of Components Of Income Tax Expense (benefit)) (details)
Income Taxes (schedule Of Deferred Tax Assets And Liabilities Resulting From Temporary Differences) (details)
Income Taxes (schedule Of Effective Income Tax Rate Reconciliation) (details)
Income Taxes (schedule Of Net Operating Loss Carryforwards And Tax Credit Carryforwards) (details)
Income Taxes (tables)
Long-term Debt And Equity Financings
Long-term Debt And Equity Financings (narrative) (details)
Long-term Debt And Equity Financings (schedule Of Average Interest Rates) (details)
Long-term Debt And Equity Financings (schedule Of Debt Redemptions) (details)
Long-term Debt And Equity Financings (schedule Of Long-term Debt Outstanding) (details)
Long-term Debt And Equity Financings (schedule Of Maturities Of Long-term Debt) (details)
Long-term Debt And Equity Financings (schedule Of Outstanding Preferred Stock) (details)
Long-term Debt And Equity Financings (schedule Of Required And Actual Debt Ratios) (details)
Long-term Debt And Equity Financings (tables)
Nuclear Decommissioning Trust Fund Investments
Nuclear Decommissioning Trust Fund Investments (costs And Fair Values Of Investments In Debt Securities In Nuclear Decommissioning Trust Fund According To Contractual Maturities) (details)
Nuclear Decommissioning Trust Fund Investments (fair Value And The Gross Unrealized Losses Of The Available-for-sale Securities Held In Nuclear Decommissioning Trust Fund) (details)
Nuclear Decommissioning Trust Fund Investments (fair Values Of Investments In Debt And Equity Securities In Nuclear Decommissioning Trust Fund) (details)
Nuclear Decommissioning Trust Fund Investments (proceeds From The Sale Of Investments And Related Gross Realized Gains And Losses In Nuclear Decommissioning Trust Fund) (details)
Nuclear Decommissioning Trust Fund Investments (tables)
Other Income And Expenses
Other Income And Expenses (other Income And Expenses) (details)
Other Income And Expenses (tables)
Property And Plant, Net
Property And Plant, Net (accrued Capital Expenditures) (details)
Property And Plant, Net (schedule Of Property And Plant, Net) (details)
Property And Plant, Net (tables)
Rate And Regulatory Matters
Rate And Regulatory Matters (narrative-illinois) (details)
Rate And Regulatory Matters (schedule Of Regulatory Assets And Liabilities) (details)
Rate And Regulatory Matters (tables)
Rate And Regulatory Matters Rate And Regulatory Matters (narrative-federal) (details)
Rate And Regulatory Matters Rate And Regulatory Matters (narrative-missouri) (details)
Related Party Transactions
Related Party Transactions (details)
Related Party Transactions (narrative) (details)
Related Party Transactions (tables)
Retirement Benefits
Retirement Benefits (assumptions Used To Determine Benefit Obligations) (details)
Retirement Benefits (assumptions Used To Determine Net Periodic Benefit Cost) (details)
Retirement Benefits (cash Contributions Made To Benefit Plans) (details)
Retirement Benefits (changes In The Fair Value Of Plan Assets Classified As Level 3) (details)
Retirement Benefits (components Of Net Periodic Benefit Cost) (details)
Retirement Benefits (fair Value Of Plan Assets Utilizing Fair Value Hierarchy) (details)
Retirement Benefits (funded Status Of Benefit Plans And Amounts Included In Regulatory Assets And Oci) (details)
Retirement Benefits (narrative) (details)
Retirement Benefits (schedule Of Expected Payments From Qualified Trust And Company Funds) (details)
Retirement Benefits (schedule Of Matching Contributions) (details)
Retirement Benefits (schedule Of Potential Changes In Key Assumptions) (details)
Retirement Benefits (summary Of Benefit Liability Recorded) (details)
Retirement Benefits (summary Of Benefit Plan Costs Incurred) (details)
Retirement Benefits (summary Of Estimated Amortizable Amounts From Regulatory Assets And Accumulated Oci Into Net Periodic Benefit Cost) (details)
Retirement Benefits (tables)
Retirement Benefits (target Allocation Of The Plans' Asset Categories) (details)
Schedule I - Condensed Financial Information Of Parent
Schedule I - Condensed Financial Information Of Parent (balance Sheet) (details)
Schedule I - Condensed Financial Information Of Parent (impairment And Other Charges) (details)
Schedule I - Condensed Financial Information Of Parent (statement Of Cash Flows) (details)
Schedule I - Condensed Financial Information Of Parent (statement Of Income) (details)
Schedule Ii - Valuation And Qualifying Accounts
Schedule Ii - Valuation And Qualifying Accounts (details)
Segment Information
Segment Information (details)
Segment Information (tables)
Selected Quarterly Information
Selected Quarterly Information (summary Of Selected Quarterly Information) (details)
Selected Quarterly Information (tables)
Short-term Debt And Liquidity
Short-term Debt And Liquidity (narrative) (details)
Short-term Debt And Liquidity (schedule Of Maximum Aggregate Amount Available On Credit Agreements) (details)
Short-term Debt And Liquidity (tables)
Short-term Debt And Liquidity Short-term Debt And Liquidity (commercial Paper) (details)
Stock-based Compensation
Stock-based Compensation (narrative) (details)
Stock-based Compensation (summary Of Nonvested Shares) (details)
Stock-based Compensation (tables)
Summary Of Significant Accounting Policies
Summary Of Significant Accounting Policies (basic And Diluted Earnings Per Share Calculations) (details)
Summary Of Significant Accounting Policies (narrative) (details)
Summary Of Significant Accounting Policies (policy)
Summary Of Significant Accounting Policies (schedule Of Asset Retirement Obligations) (details)
Summary Of Significant Accounting Policies (schedule Of Excise Taxes) (details)
Summary Of Significant Accounting Policies (schedule Of Material And Supplies) (details)
Summary Of Significant Accounting Policies (schedule Of Rates Used For Allowance For Funds Used During Construction) (details)
Summary Of Significant Accounting Policies (tables)
Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (supplemental Cash Flow Information) (details)
Ticker: AILIM
CIK: 18654
Form Type: 10-K Annual Report
Accession Number: 0001002910-16-000205
Submitted to the SEC: Fri Feb 26 2016 5:49:07 PM EST
Accepted by the SEC: Fri Feb 26 2016
Period: Thursday, December 31, 2015
Industry: Electric And Other Services Combined

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