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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue:        
Total revenue $ 370 $ 776 $ 974 $ 1,561
Operating profit (loss):        
Total operating profit (loss) (29) 17 (362) 40
United States [Member]        
Revenue:        
Total revenue 260 605 701 1,205
Operating profit (loss):        
Total operating profit (loss) (24) 16 (228) 35
Canada [Member]        
Revenue:        
Total revenue 41 74 119 160
Operating profit (loss):        
Total operating profit (loss) (5) 1 (63) 3
International [Member]        
Revenue:        
Total revenue $ 69 $ 97 154 196
Operating profit (loss):        
Total operating profit (loss)     $ (71) $ 2