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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)