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Short-term Borrowings Short-term Borrowings (Summary of Short-term Borrowings) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding at year-end | $ 0 | $ 0 | $ 71
Weighted average interest rate at year-end | 0.00% | 0.00% | 1.50%
Maximum month-end balance during the year | $ 2 | $ 1,513 | $ 835
Average balance outstanding during the year | $ 2 | $ 30 | $ 113
Weighted average interest rate during the year | 0.06% | 0.97% | 2.28%
Other Short-term Borrowings |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding at year-end | $ 0 | $ 0 | $ 0
Weighted average interest rate at year-end | 0.00% | 0.00% | 0.00%
Maximum month-end balance during the year | $ 0 | $ 1,250 | $ 1,200
Average balance outstanding during the year | $ 0 | $ 284 | $ 256
Weighted average interest rate during the year | 0.00% | 0.25% | 2.44%

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