Shareholders' Equity - OCI Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Pretax
Total other comprehensive income (loss)	$ 991	$ (2,467)		$ (637)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(211)	563		139
Net of Tax
Arising during the period	756	(1,985)		(71)
Reclassification to net income	24	81		(427)
Total other comprehensive income (loss), net of tax	780	(1,904)	[1]	(498)	[1]
Reclassification in net income
Interest and debt expense	(324)	(198)	[2]	(191)	[2]
Reclassification
Reclassification in net income
Interest and debt expense	1	1		1
Net unrealized gains (losses) on securities
Pretax
Total other comprehensive income (loss)	1,043	(3,958)		(1,175)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(241)	882		254
Net of Tax
Arising during the period	779	(3,143)		(478)
Reclassification to net income	23	67		(443)
Total other comprehensive income (loss), net of tax	802	(3,076)		(921)
Net unrealized gains (losses) on securities arising during the period
Pretax
Arising during the period	1,038	(4,146)		(622)
Income Tax Benefit (Expense)
Arising during the period	(240)	918		137
Net of Tax
Arising during the period	798	(3,228)		(485)
Reclassification of net (gains) losses on securities included in net income
Pretax
Reclassification to net income	29	85		(561)
Income Tax Benefit (Expense)
Reclassification to net income	(6)	(18)		118
Net of Tax
Reclassification to net income	23	67		(443)
Impact of benefit reserves and reinsurance recoverables
Pretax
Arising during the period	(24)	103		8
Income Tax Benefit (Expense)
Arising during the period	5	(18)		(1)
Net of Tax
Arising during the period	(19)	85		7
Net unrealized gains (losses) on derivatives
Pretax
Arising during the period	3
Reclassification to net income	(1)	(1)		(1)
Total other comprehensive income (loss)	2	(1)		(1)
Income Tax Benefit (Expense)
Arising during the period	(1)
Reclassification to net income	1	0		0
Total other comprehensive income (loss)	0	0		0
Net of Tax
Arising during the period	2	0		0
Reclassification to net income	0	(1)		(1)
Total other comprehensive income (loss), net of tax	2	(1)		(1)
Effect of changes in discount rate assumptions on certain long-duration contracts
Pretax
Total other comprehensive income (loss)	(69)	1,095		361
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	15	(234)		(77)
Net of Tax
Arising during the period	(54)	861		284
Reclassification to net income	0	0		0
Total other comprehensive income (loss), net of tax	(54)	861		284
Effect of changes in instrument-specific credit risk on MRBs
Pretax
Total other comprehensive income (loss)	(83)	517		127
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	18	(110)		(27)
Net of Tax
Arising during the period	(65)	407		100
Reclassification to net income	0	0		0
Total other comprehensive income (loss), net of tax	(65)	407		100
Defined benefit plans
Pretax
Total other comprehensive income (loss)	19	96		67
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(4)	(20)		(14)
Net of Tax
Arising during the period	14	61		36
Reclassification to net income	1	15		17
Total other comprehensive income (loss), net of tax	15	76		53
Prior service credits and costs
Pretax
Total other comprehensive income (loss)	(1)	(1)		(3)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	0	0		1
Net of Tax
Total other comprehensive income (loss), net of tax	(1)	(1)		(2)
Net gains (losses)
Pretax
Total other comprehensive income (loss)	20	97		70
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(4)	(20)		(15)
Net of Tax
Total other comprehensive income (loss), net of tax	16	77		55
Foreign currency translation
Pretax
Total other comprehensive income (loss)	79	(216)		(16)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	1	45		3
Net of Tax
Arising during the period	80	(171)		(13)
Reclassification to net income	0	0		0
Total other comprehensive income (loss), net of tax	$ 80	$ (171)		$ (13)

[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.