Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (2,937)	$ 839	$ 295
Other comprehensive income (loss):
Unrealized investment gains (losses), net of related offsets	(349)	(1,324)	1,953
Unrealized gains (losses) on derivatives	25	86	244
Foreign currency translation adjustments	(3)	(28)	(50)
Other comprehensive income (loss), before income tax	(327)	(1,266)	2,147
Income tax (expense) benefit related to items of other comprehensive income (loss)	101	468	(701)
Other comprehensive income (loss), net of income tax	(226)	(798)	1,446
Comprehensive income (loss)	$ (3,163)	$ 41	$ 1,741