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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue:    
Total revenue $ 631 $ 548
Operating profit (loss):    
Total operating loss $ (21) $ (65)
Operating profit (loss) % of revenue:    
Total operating loss % (3.30%) (11.90%)
United States [Member]    
Revenue:    
Total revenue $ 439 $ 357
Operating profit (loss):    
Total operating loss $ (26) $ (59)
Operating profit (loss) % of revenue:    
Total operating loss % (5.90%) (16.50%)
Canada [Member]    
Revenue:    
Total revenue $ 96 $ 63
Operating profit (loss):    
Total operating loss $ 3 $ (6)
Operating profit (loss) % of revenue:    
Total operating loss % 3.10% (9.50%)
International [Member]    
Revenue:    
Total revenue $ 96 $ 128
Operating profit (loss):    
Total operating loss $ 2  
Operating profit (loss) % of revenue:    
Total operating loss % 2.10%