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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenue: |  |
Total revenue | $ 604 | $ 785
Operating profit (loss): |  |
Total operating profit (loss) | (333) | 23
United States [Member] |  |
Revenue: |  |
Total revenue | 441 | 600
Operating profit (loss): |  |
Total operating profit (loss) | (204) | 19
Canada [Member] |  |
Revenue: |  |
Total revenue | 78 | 86
Operating profit (loss): |  |
Total operating profit (loss) | (58) | 2
International [Member] |  |
Revenue: |  |
Total revenue | 85 | 99
Operating profit (loss): |  |
Total operating profit (loss) | $ (71) | $ 2

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