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Derivatives and Hedging Activities (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]      
Margin on interest rate swaps $ 464   $ 368
Carrying values of hedged liabilities 23,300   18,900
Cumulative amount of fair value hedging adjustment 290   27
Net increase in interest expense on long term debt and other 12 $ 63  
Credit Valuation Adjustment      
Derivatives, Fair Value [Line Items]      
Derivative, amount of hedged item 0   0
Fair Value Hedges | Fixed-Rate Debt Obligations      
Derivatives, Fair Value [Line Items]      
Derivative, amount of hedged item 23,100   18,900
Net Investment Hedges      
Derivatives, Fair Value [Line Items]      
Notional amount of derivatives 14,300   14,300
Gains (losses) on net investment hedges, net of taxes (198) 86  
Reclassifications out of AOCI 0 0  
Foreign Exchange Contract | Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount of derivatives 30,500   28,800
Foreign Exchange Contract | Not Designated as Hedging Instrument | Other Expense      
Derivatives, Fair Value [Line Items]      
Gains in changes in fair value of derivatives not designated as hedges 15 16  
Embedded Derivative | Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount of derivatives 78   $ 78
Embedded Derivative | Not Designated as Hedging Instrument | Noninterest Income      
Derivatives, Fair Value [Line Items]      
Losses on embedded derivative $ 17 $ 4