Shareholders' Equity - OCI Components (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pretax
Total other comprehensive income (loss)		$ (462)	$ 154	$ (692)	$ 324
Income Tax Benefit (Expense)
Total other comprehensive income (loss)		101	(32)	162	(70)
Net of Tax
Total other comprehensive income (loss), net of tax		(361)	122	(530)	254
Net Unrealized Gains (Losses) on Securities
Pretax
Reclassification to net income	[1]	(502)	(4)	(553)
Total other comprehensive income (loss)		(434)	127	(702)	339
Income Tax Benefit (Expense)
Reclassification to net income	[1]	105	1	116
Total other comprehensive income (loss)		95	(32)	164	(71)
Net of Tax
Arising during the period		58	98	(101)	268
Reclassification to net income	[1]	(397)	(3)	(437)
Total other comprehensive income (loss), net of tax		(339)	95	(538)	268
Net unrealized gains (losses) on securities, excluding insurance related impact
Pretax
Arising during the period	[2]	(79)	225	(433)	562
Income Tax Benefit (Expense)
Arising during the period	[2]	21	(53)	108	(118)
Net of Tax
Arising during the period	[2]	(58)	172	(325)	444
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables
Pretax
Arising during the period		147	(94)	284	(223)
Income Tax Benefit (Expense)
Arising during the period		(31)	20	(60)	47
Net of Tax
Arising during the period		116	(74)	224	(176)
Net Unrealized Gains (Losses) on Derivatives
Net of Tax
Total other comprehensive income (loss), net of tax		0	0	0	0
Defined Benefit Plans
Pretax
Total other comprehensive income (loss)				37
Income Tax Benefit (Expense)
Total other comprehensive income (loss)				(8)
Net of Tax
Arising during the period				29
Total other comprehensive income (loss), net of tax		0	0	29	0
Foreign Currency Translation
Pretax
Total other comprehensive income (loss)		(28)	27	(27)	(15)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)		6		6	1
Net of Tax
Arising during the period		(22)	27	(21)	(14)
Total other comprehensive income (loss), net of tax		$ (22)	$ 27	$ (21)	$ (14)

[1] Reclassification amounts are recorded in net investment income.

[2] Includes impairments on Available-for-Sale securities related to factors other than credit that were recognized in OCI during the period.