CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 141	$ 134	$ 250	$ 226
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		25	(2)	34	60
Fixed price diesel swaps		0	2	(1)	3
Other comprehensive income		25	0	33	63
Comprehensive income (loss)	[1]	$ 166	$ 134	$ 283	$ 289

[1] There were no material reclassifications from accumulated other comprehensive loss reflected in other comprehensive income during 2017 or 2016. 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 during 2017 or 2016.