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SECURITIES - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]          
Accrued interest receivable on debt securities $ 134,000,000   $ 134,000,000   $ 125,000,000
Taxable interest income from securities $ 428,000,000 $ 417,000,000 $ 846,000,000 $ 816,000,000  
Held-to-maturity, zero expected credit loss, percent of portfolio 95.00%   95.00%    
Allowance for credit loss recognized $ 0   $ 0    
Mortgage-backed securities          
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]          
Securitizations of mortgage loans 0 $ 133,000,000 0    
Securities Sold under Agreements to Repurchase          
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]          
Debt securities at fair value $ 4,000,000,000.0   $ 4,000,000,000.0