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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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Maximum aggregate principal amount of junior subordinated notes.

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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

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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.

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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.

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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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.

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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.

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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.

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The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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