Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive Income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 112	$ 118	$ 187	$ 146
Total comprehensive income	272	351	384	621
Other comprehensive income (loss):
Total other comprehensive income	160	233	197	475
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Other comprehensive income (loss):
Total other comprehensive income	162	228	206	454
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Other comprehensive income (loss):
Total other comprehensive income	(2)	4	(9)	20
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Other comprehensive income (loss):
Total other comprehensive income	$ 0	$ 1	$ 0	$ 1