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Derivatives and Hedging Activities (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Derivatives, Fair Value [Line Items]          
Margin on interest rate swaps $ 300   $ 300   $ 175
Carrying values of hedged liabilities 17,000   17,000   11,700
Cumulative amount of fair value hedging adjustment (20)   (20)   53
Net increase in interest expense on long term debt and other 69 $ 44 132 $ 83  
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 17,100   17,100   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 197 (307) 283 (505)  
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 26,200   26,200   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 27 25 43 30  
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 $ 3 $ 4 $ (1) $ 0