Shareholder's Equity - Changes in AOCI Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Changes in balances of each component of AOCI, net of tax
Beginning balance	$ 3,803	[1],[2]	$ 4,837	[1]	$ 6,131
OCI before reclassifications	756		(1,985)		(71)
Amounts reclassified from AOCI	24		81		(427)
Total other comprehensive income (loss), net of tax	780		(1,904)	[3]	(498)	[3]
Ending balance	4,729		3,803	[1],[2]	4,837	[1]
Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					(1,897)
Total AOCI
Changes in balances of each component of AOCI, net of tax
Beginning balance	(2,546)	[1]	(642)	[1]	893
Total other comprehensive income (loss), net of tax	780		(1,904)		(498)
Ending balance	(1,766)		(2,546)	[1]	(642)	[1]
Total AOCI | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					(1,037)
Net Unrealized Gains (Losses) on Securities
Changes in balances of each component of AOCI, net of tax
Beginning balance	(2,043)		1,033		1,247
OCI before reclassifications	779		(3,143)		(478)
Amounts reclassified from AOCI	23		67		(443)
Total other comprehensive income (loss), net of tax	802		(3,076)		(921)
Ending balance	(1,241)		(2,043)		1,033
Net Unrealized Gains (Losses) on Securities | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					707
Net Unrealized Gains (Losses) on Derivatives
Changes in balances of each component of AOCI, net of tax
Beginning balance	3		4		5
OCI before reclassifications	2		0		0
Amounts reclassified from AOCI	0		(1)		(1)
Total other comprehensive income (loss), net of tax	2		(1)		(1)
Ending balance	5		3		4
Net Unrealized Gains (Losses) on Derivatives | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					0
Effect of changes in discount rate assumptions on certain long-duration contracts
Changes in balances of each component of AOCI, net of tax
Beginning balance	(72)		(933)		0
OCI before reclassifications	(54)		861		284
Amounts reclassified from AOCI	0		0		0
Total other comprehensive income (loss), net of tax	(54)		861		284
Ending balance	(126)		(72)		(933)
Effect of changes in discount rate assumptions on certain long-duration contracts | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					(1,217)
Effect of changes in instrument-specific credit risk on MRBs
Changes in balances of each component of AOCI, net of tax
Beginning balance	(20)		(427)		0
OCI before reclassifications	(65)		407		100
Amounts reclassified from AOCI	0		0		0
Total other comprehensive income (loss), net of tax	(65)		407		100
Ending balance	(85)		(20)		(427)
Effect of changes in instrument-specific credit risk on MRBs | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					(527)
Defined Benefit Plans
Changes in balances of each component of AOCI, net of tax
Beginning balance	(75)		(151)		(204)
OCI before reclassifications	14		61		36
Amounts reclassified from AOCI	1		15		17
Total other comprehensive income (loss), net of tax	15		76		53
Ending balance	(60)		(75)		(151)
Defined Benefit Plans | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					0
Foreign Currency Translation
Changes in balances of each component of AOCI, net of tax
Beginning balance	(338)		(167)		(154)
OCI before reclassifications	80		(171)		(13)
Amounts reclassified from AOCI	0		0		0
Total other comprehensive income (loss), net of tax	80		(171)		(13)
Ending balance	(258)		(338)		(167)
Foreign Currency Translation | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					0
Other
Changes in balances of each component of AOCI, net of tax
Beginning balance	(1)		(1)		(1)
OCI before reclassifications	0		0		0
Amounts reclassified from AOCI	0		0		0
Total other comprehensive income (loss), net of tax	0		0		0
Ending balance	$ (1)		$ (1)		(1)
Other | Cumulative effect of adoption of long-duration contracts guidance
Changes in balances of each component of AOCI, net of tax
Beginning balance					$ 0

[1] Certain prior period amounts have been restated. See Note 3 for more information.

[2] Certain prior period amounts have been restated. See Note 3 for more information.

[3] Certain prior period amounts have been restated. See Note 3 for more information.