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Derivatives - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount | $ 12,129,000,000 | $ 13,706,000,000 |
Derivative, Collateral, Right to Reclaim Cash | 0 | 1,000,000 |
Pledged collateral, securities | 90,000,000 | 78,000,000 |
Cash collateral held | 24,000,000 | 16,000,000 |
Securities collateral held or repledged | 1,000,000 | 1,000,000 |
Collateral Securities Repledged, Delivered, or Used | 0 | 0 |
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged | 0 | 0 |
Over the Counter [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Pledged collateral, securities | 83,000,000 | 88,000,000 |
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net reclassifications from AOCI to earnings resulting from the discontinuance of cash-flow hedges due to forecasted transactions that were no longer probable of occurring | 0 | 0 | $ 0
Accumulated Other Comprehensive Income (Loss), net of tax |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Deferred net gains on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months | 35,000,000 |  |
Not Designated as Hedging Instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount | 9,503,000,000 | $ 11,396,000,000 |
Interest rate swaps | Not Designated as Hedging Instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount | $ 7,600,000,000 |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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