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Derivatives and Hedging Activities (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Derivatives, Fair Value [Line Items]          
Margin on interest rate swaps $ 405   $ 405   $ 175
Carrying values of hedged liabilities 20,000   20,000   11,700
Cumulative amount of fair value hedging adjustment 534   534   53
Net increase in interest expense on long term debt and other 82 $ 47 214 $ 130  
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 19,600   19,600   11,700
Net Investment Hedges          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 14,500   14,500   14,100
Gains (losses) on net investment hedges, net of taxes (96) 244 187 (261)  
Reclassifications out of AOCI     0 0  
Foreign Exchange Contract | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount of derivatives 28,400   28,400   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 24 26 67 56  
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 $ 5 $ (12) $ 4 $ (12)