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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue:        
Total revenue $ 750 $ 952 $ 1,613 $ 2,029
Operating profit (loss):        
Total operating profit (loss) $ (27) $ 43 $ (35) $ 105
Operating profit (loss) %:        
Total operating profit (loss) % (3.60%) 4.50% (2.20%) 5.20%
United States [Member]        
Revenue:        
Total revenue $ 496 $ 662 $ 1,097 $ 1,366
Operating profit (loss):        
Total operating profit (loss) $ (23) $ 28 $ (35) $ 58
Operating profit (loss) %:        
Total operating profit (loss) % (4.60%) 4.20% (3.20%) 4.20%
Canada [Member]        
Revenue:        
Total revenue $ 89 $ 125 $ 205 $ 316
Operating profit (loss):        
Total operating profit (loss) $ (5) $ 2 $ (2) $ 18
Operating profit (loss) %:        
Total operating profit (loss) % (5.60%) 1.60% (1.00%) 5.70%
International [Member]        
Revenue:        
Total revenue $ 165 $ 165 $ 311 $ 347
Operating profit (loss):        
Total operating profit (loss) $ 1 $ 13 $ 2 $ 29
Operating profit (loss) %:        
Total operating profit (loss) % 0.60% 7.90% 0.60% 8.40%