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Short-Term Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of Short-term Debt | A summary of short-term borrowings for the years 2021, 2020 and 2019 is presented in the following table: Table 8.10.1 SHORT-TERM BORROWINGS
(Dollars in millions) |  | Trading Liabilities |  | Federal Funds Purchased |  | Securities Sold Under Agreements to Repurchase |  | Other Short-term Borrowings
2021 |  |  |  |  |  |  |  |
Average balance |  | $ | 540 |  |  | $ | 949 |  |  | $ | 1,235 |  |  | $ | 124 |
Year-end balance |  | 426 |  |  | 775 |  |  | 1,247 |  |  | 102 |
Maximum month-end outstanding |  | 685 |  |  | 1,037 |  |  | 1,615 |  |  | 146 |
Average rate for the year |  | 1.11 | % |  | 0.12 | % |  | 0.30 | % |  | 0.09 | %
Average rate at year-end |  | 1.62 | % |  | 0.10 | % |  | 0.11 | % |  | 0.08 | %
2020 |  |  |  |  |  |  |  |
Average balance |  | $ | 457 |  |  | $ | 862 |  |  | $ | 1,109 |  |  | $ | 626 |
Year-end balance |  | 353 |  |  | 845 |  |  | 1,187 |  |  | 166 |
Maximum month-end outstanding |  | 983 |  |  | 1,487 |  |  | 1,661 |  |  | 4,061 |
Average rate for the year |  | 1.24 | % |  | 0.34 | % |  | 0.50 | % |  | 0.84 | %
Average rate at year-end |  | 0.77 | % |  | 0.10 | % |  | 0.26 | % |  | 0.09 | %
2019 |  |  |  |  |  |  |  |
Average balance |  | $ | 503 |  |  | $ | 738 |  |  | $ | 701 |  |  | $ | 538 |
Year-end balance |  | 506 |  |  | 548 |  |  | 717 |  |  | 2,253 |
Maximum month-end outstanding |  | 754 |  |  | 1,282 |  |  | 772 |  |  | 2,276 |
Average rate for the year |  | 2.48 | % |  | 2.08 | % |  | 2.07 | % |  | 2.10 | %
Average rate at year-end |  | 2.07 | % |  | 1.55 | % |  | 1.72 | % |  | 2.14 | %

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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