Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Fixed maturity collateral pledged to FHLB	$ 1,214	$ 1,211
FHLB restricted stock	54	55
Trading securities	44	48
Cash and Cash Equivalents	14	12
Total restricted assets	2,448	2,734
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged	1,122	1,408
Securities pledged as collateral
Loss Contingencies [Line Items]
Fair value of loaned securities	838	1,159
Securities delivered as collateral	201	183
Securities Pledged under repurchase agreements, carrying value	83	66
Securities Loaned
Loss Contingencies [Line Items]
Securities delivered as collateral	$ 201	$ 183

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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