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Derivatives and Hedging Activities (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]          
Margin on interest rate swaps $ 622   $ 622   $ 368
Carrying values of hedged liabilities 30,500   30,500   18,900
Cumulative amount of fair value hedging adjustment 427   427   27
Net increase in interest expense on long term debt and other 29 $ 69 41 $ 132  
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 30,200   30,200   18,900
Net Investment Hedges          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 15,200   15,200   14,300
Gains (losses) on net investment hedges, net of taxes (551) 197 749 283  
Reclassifications out of AOCI     0 0  
Foreign Exchange Contract | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 31,400   31,400   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 4 27 19 43  
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 $ (7) $ 3 $ (24) $ (1)