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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue:    
Total revenue $ 764 $ 631
Operating profit (loss):    
Total operating loss $ 7 $ (21)
Operating profit (loss) % of revenue:    
Total operating loss % 0.90% (3.30%)
United States [Member]    
Revenue:    
Total revenue $ 562 $ 439
Operating profit (loss):    
Total operating loss $ 3 $ (26)
Operating profit (loss) % of revenue:    
Total operating loss % 0.50% (5.90%)
Canada [Member]    
Revenue:    
Total revenue $ 102 $ 96
Operating profit (loss):    
Total operating loss $ 4 $ 3
Operating profit (loss) % of revenue:    
Total operating loss % 3.90% 3.10%
International [Member]    
Revenue:    
Total revenue $ 100 $ 96
Operating profit (loss):    
Total operating loss   $ 2
Operating profit (loss) % of revenue:    
Total operating loss % 0.00% 2.10%