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Short-Term Borrowings - Components of Short-Term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt [Line Items] |  |  |
Balance at year end, Securities Sold Under Repurchase Agreements | $ 0 | $ 0 |
Federal Funds Purchased [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Balance at year end, Federal Funds Purchase | 200 | 0 | $ 3
Average during the year | 61 | 537 | 128
Maximum month-end balance | $ 1,000 | $ 3,197 | $ 2,331
Weighted-average rate during the year | 2.12% | 1.68% | 0.72%
Weighted-average rate at December 31 | 1.56% | 0.00% | 0.00%
Securities Sold under Agreements to Repurchase [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average during the year | $ 203 | $ 391 | $ 389
Maximum month-end balance | $ 283 | $ 614 | $ 472
Weighted-average rate during the year | 0.22% | 0.09% | 0.08%
Weighted-average rate at December 31 | 0.09% | 0.09% | 0.08%
Balance at year end, Securities Sold Under Repurchase Agreements | $ 187 | $ 319 | $ 374
Other Short Term Borrowings [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average during the year | 730 | 915 | 1,140
Maximum month-end balance | $ 847 | $ 1,133 | $ 1,242
Weighted-average rate during the year | 2.31% | 2.34% | 1.34%
Weighted-average rate at December 31 | 1.99% | 2.92% | 2.01%
Balance at year end, Other Short-Term Borrowings | $ 705 | $ 544 | $ 634

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- Definition Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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