Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Defined benefit plans, net: Balance at beginning of period	$ (10)	$ 3	$ (11)	$ 3
Unrealized gain on subsidiary pension	0	0	1	0
Defined benefit plans, net: Balance at end of period	(10)	3	(10)	3
Foreign currency translation adjustment: Balance at beginning of period	(769)	13	(422)	8
Translation gain (loss)	105	49	(242)	54
Foreign currency translation adjustment: Balance at end of period	(664)	62	(664)	62
Total accumulated other comprehensive (loss) income	$ (674)	$ 65	$ (674)	$ 65	$ (433)