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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue:        
Total revenue $ 400 $ 370 $ 761 $ 974
Operating profit (loss):        
Total operating profit (loss)   (29) (8) (362)
United States [Member]        
Revenue:        
Total revenue 296 260 548 701
Operating profit (loss):        
Total operating profit (loss) (3) (24) (16) (228)
Canada [Member]        
Revenue:        
Total revenue 51 41 109 119
Operating profit (loss):        
Total operating profit (loss) 2 (5) 6 (63)
International [Member]        
Revenue:        
Total revenue 53 $ 69 104 154
Operating profit (loss):        
Total operating profit (loss) $ 1   $ 2 $ (71)