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Short-Term Borrowings - Summary of Short-Term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Short-term Debt [Line Items] |  |  |
Short-term borrowings | $ 2,506 | $ 2,124 |
Trading Liabilities |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | 480 | 540 | $ 457
Short-term borrowings | 335 | 426 | 353
Maximum month-end outstanding | $ 700 | $ 685 | $ 983
Average rate for the year | 2.56% | 1.11% | 1.24%
Average rate at year-end | 3.67% | 1.62% | 0.77%
Federal Funds Purchased |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | $ 699 | $ 949 | $ 862
Short-term borrowings | 400 | 775 | 845
Maximum month-end outstanding | $ 1,023 | $ 1,037 | $ 1,487
Average rate for the year | 1.56% | 0.12% | 0.34%
Average rate at year-end | 4.40% | 0.10% | 0.10%
Securities Sold Under Agreements to Repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | $ 881 | $ 1,235 | $ 1,109
Short-term borrowings | 1,013 | 1,247 | 1,187
Maximum month-end outstanding | $ 1,211 | $ 1,615 | $ 1,661
Average rate for the year | 0.77% | 0.30% | 0.50%
Average rate at year-end | 2.19% | 0.11% | 0.26%
Other Short-term Borrowings |  |  |
Short-term Debt [Line Items] |  |  |
Average balance | $ 229 | $ 124 | $ 626
Short-term borrowings | 1,093 | 102 | 166
Maximum month-end outstanding | $ 1,093 | $ 146 | $ 4,061
Average rate for the year | 2.26% | 0.09% | 0.84%
Average rate at year-end | 4.30% | 0.08% | 0.09%

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