Cover Page - USD ($)
12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 28, 2019
Entity Information [Line Items]   
Document Type10-K  
Document Annual Reporttrue  
Document Period End DateDec. 31, 2019  
Document Transition Reportfalse  
Entity File Number001-36129  
Entity Registrant NameONEMAIN HOLDINGS, INC.  
Entity Incorporation, State or Country CodeDE  
Entity Tax Identification Number27-3379612  
Entity Address, Address Line One601 N.W. Second Street  
Entity Address, City or TownEvansville  
Entity Address, State or ProvinceIN  
Entity Address, Postal Zip Code47708  
City Area Code812  
Local Phone Number424-8031  
Title of 12(b) SecurityCommon Stock, par value $0.01 per share  
Trading SymbolOMF  
Security Exchange NameNYSE  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Interactive Data CurrentYes  
Entity Filer CategoryLarge Accelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
Entity Public Float  $ 2,596,092,195
Entity Common Stock, Shares Outstanding 136,194,462 
Documents Incorporated by ReferenceThe information required by Part III (Items 10, 11, 12, 13, and 14) of this Annual Report on Form 10-K is incorporated by reference from OneMain Holdings, Inc.'s Definitive Proxy Statement for its 2020 Annual Meeting to be filed with the Securities and Exchange Commission pursuant to Regulation 14A.  
Entity Central Index Key0001584207  
Current Fiscal Year End Date--12-31  
Amendment Flagfalse  
Document Fiscal Year Focus2019  
Document Fiscal Period FocusFY  
SFC   
Entity Information [Line Items]   
Document Type10-K  
Document Annual Reporttrue  
Document Period End DateDec. 31, 2019  
Document Transition Reportfalse  
Entity File Number001-06155  
Entity Registrant NameSPRINGLEAF FINANCE CORP  
Entity Incorporation, State or Country CodeIN  
Entity Tax Identification Number35-0416090  
Entity Address, Address Line One601 N.W. Second Street  
Entity Address, City or TownEvansville  
Entity Address, State or ProvinceIN  
Entity Address, Postal Zip Code47708  
City Area Code812  
Local Phone Number424-8031  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Interactive Data CurrentYes  
Entity Filer CategoryNon-accelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
Entity Public Float  $ 0
Entity Common Stock, Shares Outstanding 10,160,021 
Documents Incorporated by ReferenceThe information required by Part III (Items 10, 11, 12, 13, and 14) of this Annual Report on Form 10-K is incorporated by reference from OneMain Holdings, Inc.'s Definitive Proxy Statement for its 2020 Annual Meeting to be filed with the Securities and Exchange Commission pursuant to Regulation 14A.  
Entity Central Index Key0000025598  
Current Fiscal Year End Date--12-31  
Amendment Flagfalse  
Document Fiscal Year Focus2019  
Document Fiscal Period FocusFY  

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