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Derivatives - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 08, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | $ 13,706,000,000 | $ 12,291,000,000 |  |
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 |
Derivative, Collateral, Right to Reclaim Cash | 1,000,000 | 4,000,000 |  |
Pledged collateral, securities | 78,000,000 | 67,000,000 |  |
Cash collateral held | 16,000,000 | 9,000,000 |  |
Securities collateral held or repledged | 1,000,000 | 5,000,000 |  |
Collateral Securities Repledged, Delivered, or Used | 0 | $ 0 |  |
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged | 0 |  |  |
Information about Sources and Uses of Collateral that is Received Through Resale Agreements and Securities Borrowing Agreements |  | not sell any securities held as collateral |  |
Over the Counter [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Pledged collateral, securities | 88,000,000 | $ 89,000,000 |  |
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 |  |  |
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 | 16,000,000 |  |  |
Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 2,310,000,000 | 2,193,000,000 |  |
Designated as Hedging Instrument | Interest rate swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 2,040,000,000 | 2,040,000,000 |  |
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 11,396,000,000 | 10,098,000,000 |  |
Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | $ 7,600,000,000 | $ 7,100,000,000 |  |
Not Designated as Hedging Instrument | Contingent capital facility put option |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Junior Subordinated Debentures |  |  |  | $ 500,000,000
Maximum [Member] | Not Designated as Hedging Instrument | Contingent capital facility put option |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount |  |  |  | $ 500,000,000

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- Definition The carrying value as of the balance sheet date of securities received as collateral from a counterparty that were re-pledged, sold, delivered or otherwise reused by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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