Shareholder's Equity - Changes in AOCI Components (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022
Changes in balances of each component of AOCI, net of tax
Beginning balance	$ 4,144	$ 4,524		$ 3,803	[1]	$ 4,837
OCI before reclassifications	(359)	(518)		204		(1,102)
Amounts reclassified from AOCI	(5)	12		(7)		(4)
Total other comprehensive income (loss), net of tax	(364)	(506)	[2]	197		(1,106)	[2]
Ending balance	4,080	4,070	[3]	4,080		4,070	[3]
Total AOCI
Changes in balances of each component of AOCI, net of tax
Beginning balance	(1,985)	(1,242)		(2,546)		(642)
Total other comprehensive income (loss), net of tax	(364)	(506)		197		(1,106)
Ending balance	(2,349)	(1,748)	[3]	(2,349)		(1,748)	[3]
Net unrealized gains (losses) on securities
Changes in balances of each component of AOCI, net of tax
Beginning balance	(1,613)	(187)		(2,043)		1,033
OCI before reclassifications	(333)	(1,079)		99		(2,283)
Amounts reclassified from AOCI	(5)	12		(7)		(4)
Total other comprehensive income (loss), net of tax	(338)	(1,067)		92		(2,287)
Ending balance	(1,951)	(1,254)		(1,951)		(1,254)
Net unrealized gains (losses) on derivatives
Changes in balances of each component of AOCI, net of tax
Beginning balance	5	5		3		4
OCI before reclassifications	0	(2)		2		(1)
Amounts reclassified from AOCI	0	0		0		0
Total other comprehensive income (loss), net of tax	0	(2)		2		(1)
Ending balance	5	3		5		3
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	(137)	(571)		(72)		(933)
OCI before reclassifications	59	328		(6)		690
Amounts reclassified from AOCI	0	0		0		0
Total other comprehensive income (loss), net of tax	59	328		(6)		690
Ending balance	(78)	(243)		(78)		(243)
Effect of changes in instrument-specific credit risk on MRBs
Changes in balances of each component of AOCI, net of tax
Beginning balance	141	(124)		(20)		(427)
OCI before reclassifications	(126)	357		35		660
Amounts reclassified from AOCI	0	0		0		0
Total other comprehensive income (loss), net of tax	(126)	357		35		660
Ending balance	15	233		15		233
Defined benefit plans
Changes in balances of each component of AOCI, net of tax
Beginning balance	(75)	(151)		(75)		(151)
OCI before reclassifications	0	0		0		0
Amounts reclassified from AOCI	0	0		0		0
Total other comprehensive income (loss), net of tax	0	0		0		0
Ending balance	(75)	(151)		(75)		(151)
Foreign currency translation
Changes in balances of each component of AOCI, net of tax
Beginning balance	(305)	(213)		(338)		(167)
OCI before reclassifications	41	(122)		74		(168)
Amounts reclassified from AOCI	0	0		0		0
Total other comprehensive income (loss), net of tax	41	(122)		74		(168)
Ending balance	(264)	(335)		(264)		(335)
Other
Changes in balances of each component of AOCI, net of tax
Beginning balance	(1)	(1)		(1)		(1)
OCI before reclassifications	0	0		0		0
Amounts reclassified from AOCI	0	0		0		0
Total other comprehensive income (loss), net of tax	0	0		0		0
Ending balance	$ (1)	$ (1)		$ (1)		$ (1)

[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.