CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income		$ 86	$ 94	$ 201	$ 154
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		16	35	(73)	(3)
Fixed price diesel swaps		1	1	1	0
Other comprehensive income (loss)		17	36	(72)	(3)
Comprehensive income	[1]	$ 103	$ 130	$ 129	$ 151

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