Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		$ 71,769	$ 75,381
Other comprehensive income (loss)		389	(763)
Balance at end of period		$ 71,580	74,034
Accounting Standards Update [Extensible List]		Accounting Standards Update 2018-12
Cumulative Effect, Period of Adoption, Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	[1]		(540)
Net unrealized investment gains (losses)
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		$ (1,519)	778
Other comprehensive income (loss) before reclassifications, net of tax		339	(1,207)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		131	75
Other comprehensive income (loss)		470	(1,132)
Balance at end of period		(1,049)	(334)
OCI before reclassifications, pre-tax		340	(1,375)
Amounts reclassified, pre-tax		131	77
Net unrealized investment gains (losses) | Cumulative Effect, Period of Adoption, Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		0	20
Adoption of new accounting standard, pre-tax				$ 0	$ 26
Change in discount rate on long-duration insurance reserves
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		219	0
Other comprehensive income (loss) before reclassifications, net of tax		(74)	369
Other comprehensive income (loss)		(74)	369
Balance at end of period		145	(282)
OCI before reclassifications, pre-tax		(101)	475
Change in discount rate on long-duration insurance reserves | Cumulative Effect, Period of Adoption, Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		0	(651)
Adoption of new accounting standard, pre-tax				$ 0	$ (838)
Foreign currency translation adjustments
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		0	0
Other comprehensive income (loss) before reclassifications, net of tax		(1)	3
Other comprehensive income (loss)		(1)	3
Balance at end of period		(1)	3
Net cash flow hedges
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		239	222
Other comprehensive income (loss) before reclassifications, net of tax		(4)	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		(2)	(3)
Other comprehensive income (loss)		(6)	(3)
Balance at end of period		233	219
OCI before reclassifications, pre-tax		(5)	0
Amounts reclassified, pre-tax		(3)	(4)
Amount expected to be reclassified		14
Pension and other postretirement benefits
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		(203)	(35)
Other comprehensive income (loss)		0	0
Balance at end of period		(203)	(35)
AOCI Including Portion Attributable to Noncontrolling Interest
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		(1,264)	965
Balance at end of period		(875)	(429)
AOCI Including Portion Attributable to Noncontrolling Interest | Cumulative Effect, Period of Adoption, Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		$ 0	$ (631)

[1] Reflects the adoption of Accounting Standards Update (“ASU”) 2018-12, Targeted Improvements to the Accounting for Long-Duration Contracts (Topic 944) during the three months ended March 31, 2023. See Note 1 ‘‘Significant Accounting Policies’’ for additional information.