ASU 2018-12 Transition - Balance of Changes in FPB due to Adoption of ASU 2018-012 (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				$ 4,128
Less: Reinsurance recoverable				1,115
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				(78)
Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance, net of reinsurance				3,013
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				4,005
Revision of Prior Period, Accounting Standards Update, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				201
Immediate annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				2,175
Less: Reinsurance recoverable	$ 116	$ 118	$ 145	322
Immediate annuities | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				201
Immediate annuities | Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance, net of reinsurance				1,853
Immediate annuities | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				1,861
Immediate annuities | Revision of Prior Period, Accounting Standards Update, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				113
Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				1,953
Less: Reinsurance recoverable	$ 413	$ 612	$ 749	793
Traditional Life | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				(279)
Traditional Life | Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance, net of reinsurance				1,160
Traditional Life | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				2,144
Traditional Life | Revision of Prior Period, Accounting Standards Update, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefit				$ 88