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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%

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