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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue:    
Total revenue $ 785 $ 764
Operating profit:    
Total operating loss $ 23 $ 7
Operating profit % of revenue:    
Total operating profit % 2.90% 0.90%
United States [Member]    
Revenue:    
Total revenue $ 600 $ 562
Operating profit:    
Total operating loss $ 19 $ 3
Operating profit % of revenue:    
Total operating profit % 3.20% 0.50%
Canada [Member]    
Revenue:    
Total revenue $ 86 $ 102
Operating profit:    
Total operating loss $ 2 $ 4
Operating profit % of revenue:    
Total operating profit % 2.30% 3.90%
International [Member]    
Revenue:    
Total revenue $ 99 $ 100
Operating profit:    
Total operating loss $ 2  
Operating profit % of revenue:    
Total operating profit % 2.00% 0.00%