Shareholders' Equity - OCI Components (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Pretax
Total other comprehensive income (loss)	$ (634)	$ (1,186)		$ (388)	$ (2,631)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	143	269		94	608
Net of Tax
Arising during the period	(521)	(985)		(317)	(2,087)
Reclassification to net income	30	68		23	64
Total other comprehensive income (loss), net of tax	(491)	(917)	[1]	(294)	(2,023)	[1]
Net unrealized gains (losses) on securities
Pretax
Total other comprehensive income (loss)	(802)	(1,329)		(690)	(4,276)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	179	300		159	960
Net of Tax
Arising during the period	(653)	(1,097)		(554)	(3,380)
Reclassification to net income	30	68		23	64
Total other comprehensive income (loss), net of tax	(623)	(1,029)		(531)	(3,316)
Net unrealized gains (losses) on securities arising during the period
Pretax
Arising during the period	(854)	(1,435)		(727)	(4,467)
Income Tax Benefit (Expense)
Arising during the period	190	321		167	996
Net of Tax
Arising during the period	(664)	(1,114)		(560)	(3,471)
Reclassification of net (gains) losses on securities included in net income
Pretax
Reclassification to net income	38	86		29	81
Income Tax Benefit (Expense)
Reclassification to net income	(8)	(18)		(6)	(17)
Net of Tax
Reclassification to net income	30	68		23	64
Impact of benefit reserves and reinsurance recoverables
Pretax
Arising during the period	14	20		8	110
Income Tax Benefit (Expense)
Arising during the period	(3)	(3)		(2)	(19)
Net of Tax
Arising during the period	11	17		6	91
Net unrealized gains (losses) on derivatives
Pretax
Arising during the period				3	(1)
Total other comprehensive income (loss)				3	(1)
Income Tax Benefit (Expense)
Arising during the period				(1)	0
Total other comprehensive income (loss)				(1)	0
Net of Tax
Arising during the period	0	0		2	(1)
Reclassification to net income	0	0		0	0
Total other comprehensive income (loss), net of tax	0	0		2	(1)
Effect of changes in discount rate assumptions on certain long-duration contracts
Pretax
Total other comprehensive income (loss)	221	306		213	1,183
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(47)	(65)		(45)	(252)
Net of Tax
Arising during the period	174	241		168	931
Reclassification to net income	0	0		0	0
Total other comprehensive income (loss), net of tax	174	241		168	931
Effect of changes in instrument-specific credit risk on MRBs
Pretax
Total other comprehensive income (loss)	23	(4)		68	835
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(5)	1		(15)	(178)
Net of Tax
Arising during the period	18	(3)		53	657
Reclassification to net income	0	0		0	0
Total other comprehensive income (loss), net of tax	18	(3)		53	657
Defined benefit plans
Pretax
Total other comprehensive income (loss)	0	1		0	1
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	0	0		0	0
Net of Tax
Arising during the period	0	1		0	1
Reclassification to net income	0	0		0	0
Total other comprehensive income (loss), net of tax	0	1		0	1
Net gains (losses)
Pretax
Arising during the period				0	1
Total other comprehensive income (loss)	0	1
Income Tax Benefit (Expense)
Arising during the period				0	0
Total other comprehensive income (loss)	0	0
Net of Tax
Arising during the period				0	1
Total other comprehensive income (loss), net of tax	0	1
Foreign currency translation
Pretax
Total other comprehensive income (loss)	(76)	(160)		18	(373)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	16	33		(4)	78
Net of Tax
Arising during the period	(60)	(127)		14	(295)
Reclassification to net income	0	0		0	0
Total other comprehensive income (loss), net of tax	$ (60)	$ (127)		$ 14	$ (295)

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