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Derivatives and Hedging Activities (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Derivatives, Fair Value [Line Items]      
Margin on interest rate swaps $ 194   $ 175
Carrying values of hedged liabilities 13,300   11,700
Cumulative amount of fair value hedging adjustment (80)   53
Net increase in interest expense on long term debt and other 63 $ 39  
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 13,400   11,700
Net Investment Hedges      
Derivatives, Fair Value [Line Items]      
Notional amount of derivatives 14,300   14,100
Gains (losses) on net investment hedges, net of taxes 86 (198)  
Reclassifications out of AOCI 0 0  
Foreign Exchange Contract | Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount of derivatives 24,300   25,300
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 16 5  
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 $ 4 $ 4