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Business and Basis of Presentation Correction of an Error in Prior Periods (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Operating revenue | $ 452 | $ 392 | $ 1,382 | $ 1,015
Operating income (loss) | 25 | (147) | 37 | (274)
Provision (benefit) for income taxes | (3) | (111) | (4) | (269)
Net Income (Loss) | (59) | (135) | (226) | (263)
Comprehensive income (loss) | (54) | (139) | (217) | (273)
Provision (benefit) for deferred income taxes |  |  | (4) | (243)
Change in accounts payable and accrued liabilities |  |  | (60) | (15)
Net cash provided by operating activities |  |  | 305 | 250
Basic and diluted earnings (loss) per common share ($ per share) | $ (3.41) | $ (7.85) | $ (13.08) | $ (18.55)
As Reported |  |  |  |
Operating revenue |  | 397 |  | 1,030
Operating income (loss) |  | (142) |  | (259)
Provision (benefit) for income taxes |  | (109) |  | (258)
Net Income (Loss) |  | (132) |  | (259)
Comprehensive income (loss) |  | (136) |  | (269)
Provision (benefit) for deferred income taxes |  |  |  | (232)
Change in accounts payable and accrued liabilities |  |  |  | (30)
Net cash provided by operating activities |  |  |  | 250
Basic and diluted earnings (loss) per common share ($ per share) |  | $ (7.66) |  | $ (18.29)
Correction |  |  |  |
Operating revenue |  | (5) |  | (15)
Operating income (loss) |  | (5) |  | (15)
Provision (benefit) for income taxes |  | (2) |  | (11)
Net Income (Loss) |  | (3) |  | (4)
Comprehensive income (loss) |  | (3) |  | (4)
Provision (benefit) for deferred income taxes |  |  |  | (11)
Change in accounts payable and accrued liabilities |  |  |  | 15
Net cash provided by operating activities |  |  |  | $ 0
Basic and diluted earnings (loss) per common share ($ per share) |  | $ (0.19) |  | $ (0.26)

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