Shareholders' Equity Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net unrealized gains on securities before tax [Abstract]
Net unrealized gains (losses) on securities arising during the period, before tax	[1]	$ 225	$ 294	$ 562	$ 1,463
Reclassification of net (gains) losses on securities included in net income, before tax	[2]	(4)	10	0	5
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, before tax		(94)	(195)	(223)	(694)
Net unrealized gains (losses) on securities, before tax		127	109	339	774
Net unrealized losses on derivatives tax impact [Abstract]
Reclassification of net (gains) losses on derivatives included in net income, before tax	[3]			0	(1)
Net unrealized gains (losses) on derivatives, before tax				0	(1)
Foreign currency translation, before tax		27	(23)	(15)	(32)
Total other comprehensive income (loss), before tax		154	86	324	741
Net unrealized gains (losses) on securities, tax impact [Abstract]
Net unrealized gains (losses) on securities arising during the period, tax	[1]	(53)	(58)	(118)	(259)
Reclassification of net (gains) losses on securities included in net income, tax		1	(2)	0	(1)
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, tax		20	41	47	146
Net unrealized gains (losses) on securities, tax		(32)	(19)	(71)	(114)
Net unrealized losses on derivatives, tax impact [Abstract]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax				0	0
Net unrealized gains (losses) on derivatives, tax				0	0
Foreign currency translation, tax		0	1	1	1
Total other comprehensive income (loss), tax		(32)	(18)	(70)	(113)
Net unrealized gains (losses) on securities, net of tax [Abstract]
Net unrealized gains (losses) on securities arising during the period, net of tax	[1]	172	236	444	1,204
Reclassification of net (gains) losses on securities included in net income, net of tax		(3)	8	0	4
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, net of tax		(74)	(154)	(176)	(548)
Net unrealized gains (losses) on securities, net of tax		95	90	268	660
Net unrealized losses on derivatives, net of tax [Abstract]
Reclassification of net (gains) losses on derivatives included in net income, net of tax				0	(1)
Net unrealized gains (losses) on derivatives, net of tax				0	(1)
Foreign currency translation adjustment, net of tax		27	(22)	(14)	(31)
Total other comprehensive income (loss), net of tax		$ 122	$ 68	254	628
Interest Expense, Borrowings [Member]
Net unrealized losses on derivatives, net of tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net				$ 0	$ 1

[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.

[3] Includes nil and $1 million pretax gain reclassified to interest and debt expense for the nine months ended September 30, 2020 and 2019, respectively.