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Short-Term Borrowings - Components of Short-Term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Short-term Debt [Line Items] |  |  |
Balance at year end, securities sold under repurchase agreements | $ 0 | $ 0 |
FEDERAL FUNDS PURCHASED |  |  |
Short-term Debt [Line Items] |  |  |
Balance at year end, federal funds purchase | 0 | 4,006 | $ 0
Average during the year | 1,098 | 1,490 | 0
Maximum month-end balance | $ 3,020 | $ 5,872 | $ 0
Weighted-average rate during the year | 4.83% | 2.04% | 0.00%
Weighted-average rate at year end | 0.00% | 4.18% | 0.00%
SECURITIES SOLD UNDER REPURCHASE AGREEMENTS |  |  |
Short-term Debt [Line Items] |  |  |
Average during the year | $ 549 | $ 617 | $ 239
Maximum month-end balance | $ 1,954 | $ 1,090 | $ 281
Weighted-average rate during the year | 4.77% | 1.66% | 0.02%
Weighted-average rate at year end | 1.63% | 3.74% | 0.01%
Balance at year end, securities sold under repurchase agreements | $ 38 | $ 71 | $ 173
OTHER SHORT-TERM BORROWINGS |  |  |
Short-term Debt [Line Items] |  |  |
Average during the year | 5,890 | 2,963 | 770
Maximum month-end balance | $ 1,061 | $ 11,372 | $ 897
Weighted-average rate during the year | 5.24% | 1.82% | 1.08%
Weighted-average rate at year end | 5.58% | 0.50% | 1.97%
Balance at year end, other short-term borrowings | $ 3,053 | $ 5,386 | $ 588

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-10 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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