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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue:        
Total revenue $ 697 $ 520 $ 1,979 $ 1,569
Operating profit (loss):        
Total operating loss $ (6) $ (53) $ (41) $ (175)
Operating profit (loss) % of revenue:        
Total operating loss % (0.90%) (10.20%) (2.10%) (11.20%)
United States [Member]        
Revenue:        
Total revenue $ 506 $ 372 $ 1,426 $ 1,066
Operating profit (loss):        
Total operating loss $ (10) $ (46) $ (52) $ (149)
Operating profit (loss) % of revenue:        
Total operating loss % (2.00%) (12.40%) (3.60%) (14.00%)
Canada [Member]        
Revenue:        
Total revenue $ 96 $ 67 $ 271 $ 185
Operating profit (loss):        
Total operating loss $ 4 $ (2) $ 9 $ (16)
Operating profit (loss) % of revenue:        
Total operating loss % 4.20% (3.00%) 3.30% (8.60%)
International [Member]        
Revenue:        
Total revenue $ 95 $ 81 $ 282 $ 318
Operating profit (loss):        
Total operating loss   $ (5) $ 2 $ (10)
Operating profit (loss) % of revenue:        
Total operating loss % 0.00% (6.20%) 0.70% (3.10%)