CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 187	$ 215	$ 413	$ 416
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(9)	(71)	51	(144)
Fixed price diesel swaps		0	(1)	3	0
Other comprehensive (loss) income		(9)	(72)	54	(144)
Comprehensive income	[1]	$ 178	$ 143	$ 467	$ 272

[1] There were no material reclassifications from accumulated other comprehensive loss reflected in other comprehensive (loss) income during 2016 or 2015. There is no tax impact related to the foreign currency translation adjustments, as the earnings are considered permanently reinvested. There were no material taxes associated with other comprehensive (loss) income during 2016 or 2015.