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Short-term Borrowings Short-term Borrowings (Summary of Short-term Borrowings) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Short-term Debt [Line Items]      
Amount outstanding at year-end $ 0 $ 3,565  
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase      
Short-term Debt [Line Items]      
Amount outstanding at year-end $ 0 $ 15 $ 11
Weighted average interest rate at year-end 0.00% 5.30% 4.32%
Maximum month-end balance during the year $ 37 $ 19 $ 1,106
Average balance outstanding during the year $ 8 $ 29 $ 82
Weighted average interest rate during the year 5.28% 4.77% 3.28%
Other Short-term Borrowings      
Short-term Debt [Line Items]      
Amount outstanding at year-end $ 0 $ 3,550 $ 3,200
Weighted average interest rate at year-end 0.00% 5.74% 4.54%
Maximum month-end balance during the year $ 3,550 $ 11,000 $ 3,200
Average balance outstanding during the year $ 829 $ 7,189 $ 354
Weighted average interest rate during the year 5.74% 5.41% 4.08%