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Business Segments - Summary of Financial Information of Company's Reportable Segments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 1,619 | $ 2,951 | $ 3,127
Operating profit (loss) | (420) | (83) | 73
Impairment charges | 321 | 128 |
Depreciation and amortization | 28 | 41 | 41
Property, plant and equipment, net | 98 | 120 | 106
Total assets | 1,008 | 1,591 | 1,795
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 1,153 | 2,240 | 2,371
Operating profit (loss) | (281) | (6) | 57
Impairment charges | 189 | 43 |
Depreciation and amortization | 23 | 30 | 30
Property, plant and equipment, net | 70 | 84 | 73
Total assets | 714 | 1,034 | 1,148
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 209 | 319 | 358
Operating profit (loss) | (60) | (19) | 14
Impairment charges | 60 | 27 |
Depreciation and amortization | 2 | 2 | 2
Property, plant and equipment, net | 12 | 14 | 12
Total assets | 141 | 259 | 294
International [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 257 | 392 | 398
Operating profit (loss) | (79) | (58) | 2
Impairment charges | 72 | 58 |
Depreciation and amortization | 3 | 9 | 9
Property, plant and equipment, net | 16 | 22 | 21
Total assets | $ 153 | $ 298 | $ 353

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