Shareholders' Equity - OCI Components (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pretax
Total other comprehensive income (loss)		$ (800)	$ 463	$ 715
Income Tax Benefit (Expense)
Total other comprehensive income (loss)		174	(96)	(162)
Net of Tax
Total other comprehensive income (loss), net of tax		(626)	367	553
Reclassification in net income
Interest and debt expense		191	162	214
Net investment income		1,683	1,251	1,463
Reclassification
Reclassification in net income
Interest and debt expense		1	1	2
Net investment income		0	0	0
Net Unrealized Gains (Losses) on Securities
Pretax
Reclassification to net income	[1]	(561)	(11)	6
Total other comprehensive income (loss)		(850)	517	722
Income Tax Benefit (Expense)
Reclassification to net income		118	2	(1)
Total other comprehensive income (loss)		185	(110)	(166)
Net of Tax
Arising during the period		(222)	416	551
Reclassification to net income		(443)	(9)	5
Total other comprehensive income (loss), net of tax		(665)	407	556
Net unrealized gains (losses) on securities, excluding insurance related impact
Pretax
Arising during the period	[2]	(622)	907	1,404
Income Tax Benefit (Expense)
Arising during the period	[2]	137	(192)	(309)
Net of Tax
Arising during the period	[2]	(485)	715	1,095
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables
Pretax
Arising during the period		333	(379)	(688)
Income Tax Benefit (Expense)
Arising during the period		(70)	80	144
Net of Tax
Arising during the period		263	(299)	(544)
Net unrealized gains (losses) on derivatives
Pretax
Reclassification to net income	[3]	(1)	(2)	(3)
Total other comprehensive income (loss)		(1)	(2)	(3)
Income Tax Benefit (Expense)
Reclassification to net income			1	1
Total other comprehensive income (loss)			1	1
Net of Tax
Reclassification to net income		(1)	(1)	(2)
Total other comprehensive income (loss), net of tax		(1)	(1)	(2)
Defined Benefit Plans
Pretax
Total other comprehensive income (loss)		67	(84)	(22)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)		(14)	18	4
Net of Tax
Arising during the period		36	(66)	(28)
Reclassification to net income		17		10
Total other comprehensive income (loss), net of tax		53	(66)	(18)
Defined Benefit Plans: Prior service credit
Pretax
Total other comprehensive income (loss)		(3)	(2)	14
Income Tax Benefit (Expense)
Total other comprehensive income (loss)		1		(3)
Net of Tax
Total other comprehensive income (loss), net of tax		(2)	(2)	11
Defined Benefit Plans: Net gain (loss)
Pretax
Total other comprehensive income (loss)		70	(82)	(36)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)		(15)	18	7
Net of Tax
Total other comprehensive income (loss), net of tax		55	(64)	(29)
Foreign Currency Translation
Pretax
Total other comprehensive income (loss)		(16)	32	18
Income Tax Benefit (Expense)
Total other comprehensive income (loss)		3	(5)	(1)
Net of Tax
Arising during the period		(13)	27	17
Total other comprehensive income (loss), net of tax		$ (13)	$ 27	$ 17

[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.

[3] Includes a $1 million, $1 million and $2 million pretax gain reclassified to interest and debt expenses and nil pretax loss reclassified to net investment income for the years ended December 31, 2021, 2020 and 2019, respectively.