Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components Of Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gains/losses on securities	$ 694	$ (4,731)	$ (755)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	21	62	(549)
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total	715	(4,669)	(1,306)
Other Comprehensive Income (Loss), Other Investments Adjustment, before Tax			(2)
Net unrealized gains/losses on securities	(146)	994	159
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(4)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax	(150)	981	274
Other Comprehensive Income (Loss), Deferred Acquisition Costs, Value of Business Acquired (VOBA), and Sales Inducements Adjustment for Available-for-sale Securities, Tax		(13)	115
Net unrealized gains/losses on securities	548	(3,737)	(596)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	17
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total	565	(3,688)	(1,032)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent			2
Other Comprehensive Income (Loss), Deferred Acquisition Costs, Value of Business Acquired (VOBA), and Sales Inducements Adjustment for Available-for-sale Securities, Net of Tax		49	(434)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(36)	54	25
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	18	20	21
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	(54)	34	4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(8)	11	5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	4	4	4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(12)	7	1
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(28)	43	20
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	14	16	17
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(42)	27	3
Change in current discount rate	16	41	39
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment, Tax	3	9	8
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax	$ 13	$ 32	31
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax			(1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent			1
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax			0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent			0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax			1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent			$ (1)