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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue:        
Total revenue $ 776 $ 777 $ 1,561 $ 1,541
Operating profit:        
Total operating loss $ 17 $ 18 $ 40 $ 25
Operating profit % of revenue:        
Total operating profit % 2.20% 2.30% 2.60% 1.60%
United States [Member]        
Revenue:        
Total revenue $ 605 $ 600 $ 1,205 $ 1,162
Operating profit:        
Total operating loss $ 16 $ 16 $ 35 $ 19
Operating profit % of revenue:        
Total operating profit % 2.60% 2.70% 2.90% 1.60%
Canada [Member]        
Revenue:        
Total revenue $ 74 $ 75 $ 160 $ 177
Operating profit:        
Total operating loss $ 1 $ 1 $ 3 $ 5
Operating profit % of revenue:        
Total operating profit % 1.40% 1.30% 1.90% 2.80%
International [Member]        
Revenue:        
Total revenue $ 97 $ 102 $ 196 $ 202
Operating profit:        
Total operating loss   $ 1 $ 2 $ 1
Operating profit % of revenue:        
Total operating profit % 0.00% 1.00% 1.00% 0.50%