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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenue:    
Total revenue $ 548 $ 863
Operating profit (loss):    
Total operating loss $ (65) $ (8)
Operating profit (loss) % of revenue:    
Total operating loss % (11.90%) (0.90%)
United States [Member]    
Revenue:    
Total revenue $ 357 $ 601
Operating profit (loss):    
Total operating loss $ (59) $ (12)
Operating profit (loss) % of revenue:    
Total operating loss % (16.50%) (2.00%)
Canada [Member]    
Revenue:    
Total revenue $ 63 $ 116
Operating profit (loss):    
Total operating loss $ (6) $ 3
Operating profit (loss) % of revenue:    
Total operating loss % (9.50%) 2.60%
International [Member]    
Revenue:    
Total revenue $ 128 $ 146
Operating profit (loss):    
Total operating loss   $ 1
Operating profit (loss) % of revenue:    
Total operating loss %   0.70%