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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenue: |  |  |  |
Total revenue | $ 326 | $ 751 | $ 1,300 | $ 2,312
Operating profit (loss): |  |  |  |
Total operating profit (loss) | (21) | 14 | (383) | 54
United States [Member] |  |  |  |
Revenue: |  |  |  |
Total revenue | 228 | 567 | 929 | 1,772
Operating profit (loss): |  |  |  |
Total operating profit (loss) | (22) | 9 | (250) | 44
Canada [Member] |  |  |  |
Revenue: |  |  |  |
Total revenue | 42 | 83 | 161 | 243
Operating profit (loss): |  |  |  |
Total operating profit (loss) | 3 | 4 | (60) | 7
International [Member] |  |  |  |
Revenue: |  |  |  |
Total revenue | 56 | 101 | 210 | 297
Operating profit (loss): |  |  |  |
Total operating profit (loss) | $ (2) | $ 1 | $ (73) | $ 3

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