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Derivatives and Hedging Activities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Derivatives, Fair Value [Line Items]          
Derivative credit risk valuation adjustment, derivative assets $ 0   $ 0   $ 0
Derivative credit risk valuation adjustment, derivative liabilities 0   0   0
Margin on interest rate swaps 706   706   756
Carrying values of hedged liabilities 37,100   37,100   37,000
Cumulative amount of fair value hedging adjustment 1,163   1,163   (366)
Net increase (decrease) in interest expense on long term debt and other (8) $ 47 (39) $ 88  
Fair Value Hedges | Fixed-Rate Debt Obligations          
Derivatives, Fair Value [Line Items]          
Derivative, amount of hedged item 38,400   38,400   36,700
Net Investment Hedges          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 18,100   18,100   16,300
Derivatives used in net investment hedge, net of tax, period increase (decrease) (41) (69) 11 (818)  
Reclassifications out of AOCI 0 0 0 0  
Foreign Exchange Contract | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 37,700   37,700   $ 39,000
Foreign Exchange Contract | Not Designated as Hedging Instrument | Income Statement Location [Axis]: us-gaap:OtherNoninterestExpense          
Derivatives, Fair Value [Line Items]          
Gains in changes in fair value of derivatives not designated as hedges $ 27 $ 47 $ 68 $ 66