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Derivatives - Additional Information (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 15, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 08, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Information about Sources and Uses of Collateral that is Received Through Resale Agreements and Securities Borrowing Agreements |  | did not sell any securities held as collateral | not sell any securities held as collateral |  |
Issuance of junior subordinated debt | $ 500,000,000 |  |  |  |
Notional amount |  | $ 12,291,000,000 | $ 12,730,000,000 |  |
Deferred net gains on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months |  | 23,000,000 |  |  |
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 | $ 0 |
Collateral receivable |  | 4,000,000 | 1,000,000 |  |
Pledged collateral, securities |  | 67,000,000 | 101,000,000 |  |
Cash collateral held |  | 9,000,000 | 11,000,000 |  |
Securities collateral held |  | 5,000,000 | 2,000,000 |  |
Collateral Securities Repledged, Delivered, or Used |  | 0 | 0 |  |
Over the Counter [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Pledged collateral, securities |  | 89,000,000 | 96,000,000 |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional amount |  | 10,098,000,000 | 10,387,000,000 |  |
Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional amount |  | 2,193,000,000 | 2,343,000,000 |  |
Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Ineffectiveness recognized in income with net realized capital gains (losses) |  | 0 | 0 | $ 0 |
Interest rate swaps | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional amount |  | 7,100,000,000 | 7,300,000,000 |  |
Interest rate swaps | Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional amount |  | $ 2,040,000,000 | $ 2,190,000,000 |  |
Contingent capital facility put option | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Maximum aggregate principal amount of junior subordinated notes |  |  |  |  | $ 500,000,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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=112277219&loc=d3e80748-113994 + Details
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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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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition This describes information about the sources and uses of collateral that is acquired through resale agreements and securities borrowing agreements that the entity is permitted by contract or custom to sell or repledge. + 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)(3) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + 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 (e) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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