CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 94		$ 83		$ 154		$ 104
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	35		(32)		(3)		(52)
Fixed price diesel swaps	1		0		0		0
Other comprehensive income (loss)	36		(32)		(3)		(52)
Comprehensive income	$ 130	[1]	$ 51	[1]	$ 151	[1]	$ 52	[1]

[1] There were no material reclassifications from accumulated other comprehensive income reflected in other comprehensive income (loss) during 2014 or 2013. 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 2014 or 2013.