Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended							9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022		Sep. 30, 2023	Sep. 30, 2022		Dec. 31, 2022	Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	$ 73,002	$ 71,580	$ 71,769	$ 75,736	$ 74,034	$ 75,381		$ 71,769	$ 75,381
Other comprehensive income (loss)	(146)	17	389	(385)	(540)	(763)		260	(1,688)
Balance at end of period	74,510	73,002	71,580	71,487	75,736	74,034		74,510	71,487
Adoption of new accounting standard, adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period			454			(540)	[1]	454	(540)	[1]
AOCI Including Portion Attributable to Noncontrolling Interest
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	(858)		(1,264)	(969)		965		(1,264)	965
Balance at end of period	(1,004)	(858)		(1,354)	(969)			(1,004)	(1,354)
AOCI Including Portion Attributable to Noncontrolling Interest | Adoption of new accounting standard, 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
Net unrealized investment gains (losses)
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	(1,113)		(1,519)	(1,199)		778		(1,519)	778
Other comprehensive income (loss) before reclassifications, net of tax	(478)			(725)				(313)	(2,852)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	157			88				398	218
Other comprehensive income (loss)	(321)			(637)				85	(2,634)
Balance at end of period	(1,434)	(1,113)		(1,836)	(1,199)			(1,434)	(1,836)
OCI before reclassifications, pre-tax	(475)			(814)				(310)	(3,361)
Amounts reclassified, pre-tax	157			99				398	253
Net unrealized investment gains (losses) | Adoption of new accounting standard, 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	205		219	28		0		219	0
Other comprehensive income (loss) before reclassifications, net of tax	181			250				167	929
Other comprehensive income (loss)	181			250				167	929
Balance at end of period	386	205		278	28			386	278
OCI before reclassifications, pre-tax	233			321				210	1,195
Change in discount rate on long-duration insurance reserves | Adoption of new accounting standard, 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	2		0		0	0
Other comprehensive income (loss) before reclassifications, net of tax	(2)			(7)				(1)	(5)
Other comprehensive income (loss)	(2)			(7)				(1)	(5)
Balance at end of period	(1)	1		(5)	2			(1)	(5)
Net cash flow hedges
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	252		239	234		222		239	222
Other comprehensive income (loss) before reclassifications, net of tax	0			10				19	28
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(4)			(2)				(10)	(8)
Other comprehensive income (loss)	(4)			8				9	20
Balance at end of period	248	252		242	234			248	242
OCI before reclassifications, pre-tax	0			13				25	37
Amounts reclassified, pre-tax	(5)			(2)				(13)	(10)
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)	(34)		$ (35)		(203)	(35)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0			1				0	2
Other comprehensive income (loss)	0			1				0	2
Balance at end of period	(203)	$ (203)		(33)	$ (34)			(203)	(33)
Amounts reclassified, pre-tax	$ 0			$ 1				$ 0	$ 2

[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.