CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income		$ 215	$ 192	$ 416	$ 346
Other comprehensive loss, net of tax:
Foreign currency translation adjustments		(71)	(51)	(144)	(54)
Fixed price diesel swaps		(1)	0	0	0
Other comprehensive loss		(72)	(51)	(144)	(54)
Comprehensive income	[1]	$ 143	$ 141	$ 272	$ 292

[1] There were no material reclassifications from accumulated other comprehensive loss reflected in other comprehensive loss during 2015 or 2014. 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 during 2015 or 2014.