Deferred Policy Acquisition Costs - Life Deferred Acquisition Costs Rollforward by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	$ 1,093	$ 1,013
Capitalized deferred policy acquisition costs	417	383
Amortized deferred policy acquisition costs	(367)	(348)
Deferred policy acquisition costs asset, end of period	1,143	1,048
Life Insurance Segment
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	344	331
Capitalized deferred policy acquisition costs	10	11
Amortized deferred policy acquisition costs	(7)	(8)
Deferred policy acquisition costs asset, end of period	347	334
Life Insurance Segment | Term Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	236	228
Capitalized deferred policy acquisition costs	8	9
Amortized deferred policy acquisition costs	(6)	(6)
Deferred policy acquisition costs asset, end of period	238	231
Life Insurance Segment | Whole Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	48	43
Capitalized deferred policy acquisition costs	2	2
Amortized deferred policy acquisition costs	(1)	(1)
Deferred policy acquisition costs asset, end of period	49	44
Life Insurance Segment | Deferred Fixed Annuity
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	8	7
Capitalized deferred policy acquisition costs	0	0
Amortized deferred policy acquisition costs	0	0
Deferred policy acquisition costs asset, end of period	8	7
Life Insurance Segment | Universal life
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	52	53
Capitalized deferred policy acquisition costs	0	0
Amortized deferred policy acquisition costs	0	(1)
Deferred policy acquisition costs asset, end of period	$ 52	$ 52