Shareholder's Equity (Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent [Abstract]
Net unrealized gains (losses) on securities arising during the period, pretax	$ 1,310	$ 522	$ 292	[1]	$ 1,121	[1]
Reclassification of net (gains) losses on securities included in net income, pretax	(3)	0	5	[2]	(10)	[2]
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, pretax	(637)	(259)	(129)		(499)
Net unrealized gains (losses) on securities, pretax	670	263	168		612
Total other comprehensive income (loss), pretax	670	263	168		612
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent [Abstract]
Net unrealized gains (losses) on securities arising during the period, tax	(279)	(110)	(63)	[1]	(239)	[1]
Reclassification of net (gains) losses on securities included in net income, tax	1	0	(1)		2
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, tax	134	55	27		105
Net unrealized gains (losses) on securities, tax	(144)	(55)	(37)		(132)
Total other comprehensive income (loss), tax	(144)	(55)	(37)		(132)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent [Abstract]
Net unrealized gains (losses) on securities arising during the period, net of tax	1,031	412	229	[1]	882	[1]
Reclassification of net (gains) losses on securities included in net income, net of tax	(2)	0	4		(8)
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, net of tax	(503)	(204)	(102)		(394)
Net unrealized gains (losses) on securities, net of tax	526	208	131		480
Total other comprehensive income (loss), net of tax	$ 526	$ 208	$ 131		$ 480

[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 realized investment gains (losses).