Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		$ 71,580	$ 71,769	$ 74,034	$ 75,381	$ 71,769	$ 75,381
Other comprehensive income (loss)		17	389	(540)	(763)	406	(1,303)
Balance at end of period		$ 73,002	71,580	75,736	74,034	$ 73,002	75,736
Accounting Standards Update [Extensible List]		Accounting Standards Update 2018-12				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)		(540)
Net unrealized investment gains (losses)
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		$ (1,049)	(1,519)	(334)	778	$ (1,519)	778
Other comprehensive income (loss) before reclassifications, net of tax		(174)		(920)		165	(2,127)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		110		55		241	130
Other comprehensive income (loss)		(64)		(865)		406	(1,997)
Balance at end of period		(1,113)	(1,049)	(1,199)	(334)	(1,113)	(1,199)
OCI before reclassifications, pre-tax		(175)		(1,172)		165	(2,547)
Amounts reclassified, pre-tax		110		77		241	154
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	0	0	20	0	20
Balance at end of period			0		0
Adoption of new accounting standard, pre-tax			0		0			$ 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		145	219	(282)	0	219	0
Other comprehensive income (loss) before reclassifications, net of tax		60		310		(14)	679
Other comprehensive income (loss)		60		310		(14)	679
Balance at end of period		205	145	28	(282)	205	28
OCI before reclassifications, pre-tax		78		399		(23)	874
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	0	0	(651)	0	(651)
Balance at end of period			0		0
Adoption of new accounting standard, pre-tax			0		0			$ 0	$ (838)
Foreign currency translation adjustments
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		(1)	0	3	0	0	0
Other comprehensive income (loss) before reclassifications, net of tax		2		(1)		0	2
Other comprehensive income (loss)		2		(1)		1	2
Balance at end of period		1	(1)	2	3	1	2
Net cash flow hedges
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		233	239	219	222	239	222
Other comprehensive income (loss) before reclassifications, net of tax		2		18		(2)	18
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		17		(3)		15	(6)
Other comprehensive income (loss)		19		15		13	12
Balance at end of period		252	233	234	219	252	234
OCI before reclassifications, pre-tax		3		24		(3)	24
Amounts reclassified, pre-tax		23		(4)		20	(8)
Amount expected to be reclassified		15				15
Pension and other postretirement benefits
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		(203)	(203)	(35)	(35)	(203)	(35)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		0		1		0	1
Other comprehensive income (loss)		0		1		0	1
Balance at end of period		(203)	(203)	(34)	(35)	(203)	(34)
Amounts reclassified, pre-tax		0		1		0	1
AOCI Including Portion Attributable to Noncontrolling Interest
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period		(875)	(1,264)	(429)	965	(1,264)	965
Balance at end of period		(858)	(875)	(969)	(429)	(858)	(969)
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	0	$ 0	(631)	$ 0	$ (631)
Balance at end of period			$ 0		$ 0

[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.