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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue:        
Total revenue $ 439 $ 326 $ 1,200 $ 1,300
Operating profit (loss):        
Total operating profit (loss) 10 (21) 2 (383)
United States [Member]        
Revenue:        
Total revenue 312 228 860 929
Operating profit (loss):        
Total operating profit (loss) 4 (22) (12) (250)
Canada [Member]        
Revenue:        
Total revenue 68 42 177 161
Operating profit (loss):        
Total operating profit (loss) 5 3 11 (60)
International [Member]        
Revenue:        
Total revenue 59 56 163 210
Operating profit (loss):        
Total operating profit (loss) $ 1 $ (2) $ 3 $ (73)