Results of Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Operating revenues	$ 404	$ 403
Depreciation and amortization expense	52	52
Impairment Charges	0	15
Operating income (loss)	(23)	(14)
North America [Member]
Segment Reporting Information [Line Items]
Operating revenues	404	396
Depreciation and amortization expense	52	52
Impairment Charges	0	15
Operating income (loss)	(21)	(14)
All Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	0	7
Depreciation and amortization expense	0	0
Impairment Charges	0	0
Operating income (loss)	$ (2)	$ 0