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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue:    
Total revenue $ 361 $ 604
Operating profit (loss):    
Total operating loss (8) (333)
United States [Member]    
Revenue:    
Total revenue 252 441
Operating profit (loss):    
Total operating loss (13) (204)
Canada [Member]    
Revenue:    
Total revenue 58 78
Operating profit (loss):    
Total operating loss 4 (58)
International [Member]    
Revenue:    
Total revenue 51 85
Operating profit (loss):    
Total operating loss $ 1 $ (71)