Shareholders' Equity Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net unrealized gains (losses) on securities:
Net unrealized gains (losses) on securities arising during the period, before tax	[1]	$ (690)	$ (1,195)
Reclassification of net (gains) losses on securities included in net income, before tax	[2]	(50)	8
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, before tax		300	508
Net unrealized gains (losses) on securities, before tax		(440)	(679)
Defined benefit plans		37
Foreign currency translation, before tax		(1)	(34)
Total other comprehensive income (loss), before tax		(404)	(713)
Net unrealized gains (losses) on securities:
Net unrealized gains (losses) on securities arising during the period, tax	[1]	152	264
Reclassification of net (gains) losses on securities included in net income, tax	[2]	11	(2)
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, tax		(63)	(107)
Net unrealized gains (losses) on securities, tax		100	155
Defined benefit plans		(8)
Foreign currency translation, tax		0	1
Total other comprehensive income (loss), tax		92	156
Net unrealized gains (losses) on securities, net of tax [Abstract]
Net unrealized gains (losses) on securities arising during the period, net of tax	[1]	(538)	(931)
Reclassification of net (gains) losses on securities included in net income, net of tax	[2]	(39)	6
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, net of tax		237	401
Net unrealized gains (losses) on securities, net of tax		(340)	(524)
Defined benefit plans		29
Foreign currency translation adjustment, net of tax		(1)	(33)
Total other comprehensive income (loss), net of tax		$ (312)	$ (557)

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

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