Quarterly report [Sections 13 or 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
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value $ 555 $ 652
Loans held for investment, fair value 175 173
Long-term debt, fair value 1,143 821
Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 555 652
Loans held for investment, fair value 175 173
Long-term debt, fair value 1,143 821
Long-term debt, aggregate unpaid principal 1,138 817
Difference (5) (4)
Fair Value, Recurring | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 555 652
Loans held for sale, aggregate unpaid principal 537 640
Difference 18 12
Fair Value, Recurring | Loans held for investment    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for investment, fair value 175 173
Loans held for investment, aggregate unpaid principal 187 184
Difference (12) (11)
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 4 4
Loans held for investment, aggregate unpaid principal 5 4
Difference $ (1) $ 0