Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]    
Automobile loans, fair value $ 81 $ 79
Loans held for sale 781 613
Fair Value, Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale 781 613
Fair Value, Recurring [Member] | Mortgages Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principle 755 594
Aggregate difference (26) (19)
Fair Value, Recurring [Member] | Mortgages Held To Maturity [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for investment, aggregate unpaid principle 87 87
Automobile loans, fair value 81 79
Aggregate difference (6) (8)
Fair Value, Recurring [Member] | 90 or more days | Mortgages Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principle 2 0
Aggregate difference 0 0
Loans held for sale 2 0
Fair Value, Recurring [Member] | 90 or more days | Mortgages Held To Maturity [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for investment, aggregate unpaid principle 4 7
Automobile loans, fair value 3 6
Aggregate difference $ (1) $ (1)