Quarterly report [Sections 13 or 15(d)]

FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details) - Nonrecurring Basis - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Total Gains/(Losses)          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Collateral-dependent loans, gains (losses) $ (20) $ (16) $ (43) $ (41)  
Level 3 | Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Collateral-dependent loans $ 37   $ 37   $ 192