Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Defined benefit plans, net: Balance at beginning of period	$ (13)	$ (11)
Unrealized gain on subsidiary pension, net of tax	(1)	1
Defined benefit plans, net: Balance at end of period	(14)	(10)
Foreign currency translation adjustment: Balance at beginning of period	(1,091)	(422)
Translation income (loss)	153	(347)
Foreign currency translation adjustment: Balance at end of period	(938)	(769)
Total accumulated other comprehensive loss	$ (952)	$ (779)	$ (1,104)