Quarterly report [Sections 13 or 15(d)]

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

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FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changes in Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Recurring        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Net gains (losses) from fair value changes $ 9 $ 4 $ 15 $ (3)
Loans held for investment | Fair Value, Recurring        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Net gains (losses) from fair value changes 0 0 (1) (1)
Long-term debt | Fair Value, Recurring        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Net gains (losses) from fair value changes $ (4) $ (2) $ (5) $ (2)