Impact of New Accounting Standard (Comp Income) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income		$ 160	$ 289	$ 207	$ 253	$ 293	$ (75)	$ 106	$ 197	$ 909	$ 521	$ 1,170
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax										198	(153)	58
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	[1]									1,649	(9,454)	(1,656)
Effect of updating discount rates on future policy benefits										(499)	7,964	2,207
Change in instrument-specific credit risk for market risk benefits										(10)	20	(43)
Defined benefit pension and postretirement plan adjustments										(2)	23	22
Other Comprehensive Income (Loss), Net of Tax										1,502	(1,371)	409
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest										2,411	(850)	1,579
Comprehensive income attributable to noncontrolling interest										7	4	0
Total comprehensive income (loss)										$ 2,404	(854)	1,579
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income					521				1,170		521	1,170
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax											(102)	56
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax											(9,276)	(1,833)
Effect of updating discount rates on future policy benefits											7,964	2,207
Change in instrument-specific credit risk for market risk benefits											20	(43)
Defined benefit pension and postretirement plan adjustments											23	22
Other Comprehensive Income (Loss), Net of Tax											(1,371)	409
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest											(850)	1,579
Comprehensive income attributable to noncontrolling interest											4	0
Total comprehensive income (loss)											(854)	1,579
Previously Reported | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income					$ 627				$ 617		627	617
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax											(162)	60
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax											(9,108)	(1,799)
Effect of updating discount rates on future policy benefits											0	0
Change in instrument-specific credit risk for market risk benefits											0	0
Defined benefit pension and postretirement plan adjustments											23	22
Other Comprehensive Income (Loss), Net of Tax											(9,247)	(1,717)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest											(8,620)	(1,100)
Comprehensive income attributable to noncontrolling interest											4	0
Total comprehensive income (loss)											(8,624)	(1,100)
Revision of Prior Period, Adjustment | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income											(106)	553
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax											60	(4)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax											(168)	(34)
Effect of updating discount rates on future policy benefits											7,964	2,207
Change in instrument-specific credit risk for market risk benefits											20	(43)
Defined benefit pension and postretirement plan adjustments											0	0
Other Comprehensive Income (Loss), Net of Tax											7,876	2,126
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest											7,770	2,679
Comprehensive income attributable to noncontrolling interest											0	0
Total comprehensive income (loss)											$ 7,770	$ 2,679

[1] Includes cash flow hedges. See Note 12 for additional information on cash flow hedges.