Shareholder's Equity - Changes in AOCI Components (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023		Mar. 31, 2022
Changes in balances of each component of AOCI, net of tax
Beginning balance	$ 3,803	[1]	$ 4,837	[2]
OCI before reclassifications	563		(584)
Amounts reclassified from AOCI	(2)		(16)
Total other comprehensive income (loss), net of tax	561		(600)	[3]
Ending balance	4,144		4,524
Total AOCI
Changes in balances of each component of AOCI, net of tax
Beginning balance	(2,546)		(642)	[2]
Total other comprehensive income (loss), net of tax	561		(600)
Ending balance	(1,985)		(1,242)
Net unrealized gains (losses) on securities
Changes in balances of each component of AOCI, net of tax
Beginning balance	(2,043)		1,033
OCI before reclassifications	432		(1,204)
Amounts reclassified from AOCI	(2)		(16)
Total other comprehensive income (loss), net of tax	430		(1,220)
Ending balance	(1,613)		(187)
Net unrealized gains (losses) on derivatives
Changes in balances of each component of AOCI, net of tax
Beginning balance	3		4
OCI before reclassifications	2		1
Amounts reclassified from AOCI	0		0
Total other comprehensive income (loss), net of tax	2		1
Ending balance	5		5
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)
OCI before reclassifications	(65)		362
Amounts reclassified from AOCI	0		0
Total other comprehensive income (loss), net of tax	(65)		362
Ending balance	(137)		(571)
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)
OCI before reclassifications	161		303
Amounts reclassified from AOCI	0		0
Total other comprehensive income (loss), net of tax	161		303
Ending balance	141		(124)
Defined benefit plans
Changes in balances of each component of AOCI, net of tax
Beginning balance	(75)		(151)
OCI before reclassifications	0		0
Amounts reclassified from AOCI	0		0
Total other comprehensive income (loss), net of tax	0		0
Ending balance	(75)		(151)
Foreign currency translation
Changes in balances of each component of AOCI, net of tax
Beginning balance	(338)		(167)
OCI before reclassifications	33		(46)
Amounts reclassified from AOCI	0		0
Total other comprehensive income (loss), net of tax	33		(46)
Ending balance	(305)		(213)
Other
Changes in balances of each component of AOCI, net of tax
Beginning balance	(1)		(1)
OCI before reclassifications	0		0
Amounts reclassified from AOCI	0		0
Total other comprehensive income (loss), net of tax	0		0
Ending balance	$ (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.