Investments - Fixed Maturities and Equity Securities, Repurchase Agreement, Securities Lending, VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities received as collateral	$ 67	$ 61
Payables under securities loan agreements, including collateral held	827	845
Collateralized loan obligations \| Not a primary beneficiary of the VIE
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Carrying value of VIE	583	411
Securities pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Fair value of loaned securities	759	799
Short-term investments
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities received as collateral	719	744
Payables under securities loan agreement, including collateral held
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	$ 719	$ 744
Mortgage-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Percentage collateralized of mortgage backed securities including interest-only strip or principal-only strip	52.50%	52.10%
U.S. Treasuries
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	$ 92	$ 177
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	523	460
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	170	168
Payables under securities loan agreements
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	$ 786	$ 805

The fair value of collateral received by the entity associated with securities borrowed that must be returned if the counterparty fulfills its obligations. It appears on the balance sheet as a liability and has a corresponding asset that appears on the balance sheet called Securities Received as Collateral.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Fair value of the securities pledged as collateral against securities loaned.

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-Publisher FASB
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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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Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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Available-for-sale Securities, Including Securities Pledged [Line Items]

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Percent Collateralized Mortgage Backed Securities including Interest-Only Strip or Principal-Only Strip

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