Annual report pursuant to Section 13 and 15(d)

LOAN SALES AND SECURITIZATIONS - Automobile Loans (Details)

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LOAN SALES AND SECURITIZATIONS - Automobile Loans (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Automobile          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction         $ 750
Proceeds from new transfers         780
Gain (Loss) on Sale of Mortgage Loans     $ 0 $ 6 5
New servicing assets created         $ 11
Trust 2016 Unconsolidated          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction $ 1,500        
Trust 2016 Unconsolidated | Automobile          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction     0    
Proceeds from new transfers     0    
New servicing assets created     $ 0    
2015-1 Automobile Trust          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction   $ 750      
2015-1 Automobile Trust | Automobile          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction       1,500  
Proceeds from new transfers       1,552  
New servicing assets created       $ 15