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, 2021
Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value $ 1,270 $ 1,198
Loans held for investment, fair value 171 94
Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 1,270 1,198
Loans held for investment, fair value 171 94
Fair Value, Recurring | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principal 1,237 1,134
Difference 33 64
Fair Value, Recurring | Loans held for investment    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for investment, fair value 171 94
Loans held for investment, aggregate unpaid principal 177 99
Difference 6 5
Fair Value, Recurring | 90 or more days | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 0 2
Loans held for sale, aggregate unpaid principal 0 2
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, fair value 4 7
Loans held for investment, aggregate unpaid principal 4 8
Difference $ 0 $ 1