Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 968	$ (883)	$ (2,775)
Other comprehensive income (loss):
Unrealized investment gains (losses), net of related offsets	(1,355)	590	(535)
Unrealized gains (losses) on derivatives	22	(166)	27
Foreign currency translation adjustments	(4)	9	(3)
Other Comprehensive Income (Loss), before Tax	(1,337)	433	(511)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(72)	(294)	(3,121)
Income tax (expense) benefit related to items of other comprehensive income (loss)	297	156	165
Other Comprehensive Income (Loss), Net of Tax not including change in accounting principle	(1,040)	589	(346)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	1	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (73)	$ (294)	$ (3,121)