Annual report pursuant to Section 13 and 15(d)

LOAN SALES AND SECURITIZATIONS - Narrative (Details)

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LOAN SALES AND SECURITIZATIONS - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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      
Residential Mortgage        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Servicing Asset at Fair Value, Other Changes in Fair Value   $ 11 $ 14  
Servicing Asset at Fair Value, Period Increase (Decrease)   3 4  
Servicing, late and other ancillary fees included in mortgage banking income   56 50 $ 47
Unpaid principal balance of third party serviced loans 16,200 19,800 18,900 16,200
Pretax gains resulting from above loan sales   99 97 83
Automobile        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Servicing, late and other ancillary fees included in mortgage banking income   18 9 5
Unpaid principal balance of third party serviced loans 900 1,000 1,700 900
Total of automobile loans transferred In securitization transaction       750
Proceeds from new transfers       780
Automobile | 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     1,500  
Proceeds from new transfers     1,552  
Commercial        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Servicing, late and other ancillary fees included in mortgage banking income   11 9 8
Unpaid principal balance of third party serviced loans $ 1,000 $ 1,400 $ 1,100 $ 1,000