Results of Reportable Segment (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Operating revenues		$ 403	$ 383
Depreciation and amortization expense		52	48
Impairment charges		15	0
Operating income (loss)		(14)	7
North America [Member]
Segment Reporting Information [Line Items]
Operating revenues		396	374
Depreciation and amortization expense		52	47
Impairment charges		15
Operating income (loss)		(14)	7
All Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	[1]	7	9
Depreciation and amortization expense	[1]	0	1
Impairment charges	[1]	0
Operating income (loss)	[1]	$ 0	$ 0

[1] (1)All other is comprised of the financial results of our operations outside of North America.