Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Current:
State	$ (1)	$ 2	$ 0	$ 3
Foreign	1	0	1	0
Total	0	2	1	3
Deferred:
State	0	0	(4)	(6)
Foreign	(6)	(1)	(82)	7
Total	(6)	(1)	(86)	1
Provision (benefit) for income taxes	$ (6)	$ 1	(85)	4
TEXAS [Member]
Deferred:
State				(7)
Alberta Provincial Tax [Member]
Deferred:
Foreign				$ 8
Canadian Operations [Member]
Deferred:
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down			$ 341