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, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value $ 506 $ 520
Loans held for investment, fair value 174 185
Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 506 520
Loans held for investment, fair value 174 185
Fair Value, Recurring | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principal 489 513
Difference 17 7
Fair Value, Recurring | Loans held for investment    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for investment, fair value 174 185
Loans held for investment, aggregate unpaid principal 184 190
Difference (10) (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 0
Loans held for sale, aggregate unpaid principal 0 0
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 2 11
Loans held for investment, aggregate unpaid principal 3 11
Difference $ 1 $ 0