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Derivatives and Hedging Activities (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]          
Margin on interest rate swaps $ 721   $ 721   $ 368
Carrying values of hedged liabilities 36,300   36,300   18,900
Cumulative amount of fair value hedging adjustment 516   516   27
Net increase in interest expense on long term debt and other 47 $ 82 88 $ 214  
Credit Valuation Adjustment          
Derivatives, Fair Value [Line Items]          
Derivative, amount of hedged item 0   0   0
Fair Value Hedges | Fixed-Rate Debt Obligations          
Derivatives, Fair Value [Line Items]          
Derivative, amount of hedged item 35,900   35,900   18,900
Net Investment Hedges          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 15,800   15,800   14,300
Gains (losses) on net investment hedges, net of taxes (69) (96) (818) 187  
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 35,800   35,800   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 47 24 66 67  
Embedded Derivative | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 78   78   $ 78
Embedded Derivative | Not Designated as Hedging Instrument | Noninterest Income          
Derivatives, Fair Value [Line Items]          
Gains (losses) on embedded derivative $ 8 $ 5 $ (16) $ 4