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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]            
Unused commitments to extend credit $ 67,571   $ 63,232      
Standby letters of credit 2,281   2,096      
Commercial letters of credit 82   58      
Liabilities associated with standby letters of credit 38   33      
Assets associated with standby letters of credit 39   35      
Reserve for unfunded credit commitments $ 132 $ 131 $ 116 $ 121 $ 111 $ 124