Investments - Fixed Maturities and Equity Securities, Repurchase Agreement, Securities Lending, VIEs (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Available-for-sale Securities Including Securities Pledged [Line Items]
Rate required of collateral as a percent of market value of loans securities	102.00%
Securities received as collateral	$ 103	$ 87
Payables under securities loan agreements, including collateral held	921	811
Collateral Pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities Sold under Agreements to Repurchase, Asset	0
Securities pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Fair value of loaned securities	690	739
Short-term investments
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities received as collateral	615	677
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	$ 615	$ 677
CMOs
Available-for-sale Securities Including Securities Pledged [Line Items]
Percentage collateralized of mortgage backed securities including interest-only strip or principal-only strip	46.90%	45.10%
U.S. Treasuries
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	$ 51	$ 42
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	466	479
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	201	243
Payables under securities loan agreements
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	$ 718	$ 764

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.

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Fair value of the securities pledged as collateral against securities loaned.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
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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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Amount of asset associated with funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price.

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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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Securities Loaned, Rate Required of Collateral as a Percent of Market Value of Loans Securities

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