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, 2020
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value $ 1,198 $ 781
Loans held for investment, fair value 94 81
Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 1,198 781
Fair Value, Recurring | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principal 1,134 755
Aggregate difference (64) (26)
Fair Value, Recurring | Loans held for investment    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for investment, aggregate unpaid principal 99 87
Loans held for investment, fair value 94 81
Aggregate difference (5) (6)
Fair Value, Recurring | 90 or more days | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principal 2 2
Loans held for sale, fair value 2 2
Aggregate difference 0 0
Fair Value, Recurring | 90 or more days | Loans held for investment    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for investment, aggregate unpaid principal 8 4
Loans held for investment, fair value 7 3
Aggregate difference $ (1) $ (1)