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Property, Plant and Equipment-Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment-Net |  |  |  |  |  |
Gross property plant and equipment | $ 13,867 |  | $ 13,867 |  | $ 13,777 |
Less: Accumulated depreciation and amortization | 6,657 |  | 6,657 |  | 6,145 |
Net property, plant and equipment | 7,210 |  | 7,210 |  | 7,632 |
Construction in progress expenditures incurred but not yet paid |  |  | 78 | $ 73 | 43 | $ 42
Depreciation and amortization | 198 | $ 207 | 637 | 650 |  |
Changes in plant turnaround activity |  |  |  |  |  |
Long-lived and intangible asset impairment | 236 | 0 | 236 | 0 |  |
U.K. |  |  |  |  |  |
Changes in plant turnaround activity |  |  |  |  |  |
Long-lived and intangible asset impairment |  |  | 50 |  |  |
Long-lived assets | 450 |  | 450 |  |  |
Land |  |  |  |  |  |
Property, Plant and Equipment-Net |  |  |  |  |  |
Gross property plant and equipment | 68 |  | 68 |  | 68 |
Machinery and equipment(1) |  |  |  |  |  |
Property, Plant and Equipment-Net |  |  |  |  |  |
Gross property plant and equipment | 12,696 |  | 12,696 |  | 12,539 |
Changes in plant turnaround activity |  |  |  |  |  |
Balance at the beginning of the period |  |  | 226 | 246 | 246 |
Additions |  |  | 215 | 68 |  |
Depreciation |  |  | (84) | (77) |  |
Effect of exchange rate changes |  |  | 0 | (2) |  |
Balance at the end of the period | 357 | $ 235 | 357 | $ 235 | 226 | $ 246
Long-lived and intangible asset impairment | 169 |  |  |  |  |
Buildings and improvements(1) |  |  |  |  |  |
Property, Plant and Equipment-Net |  |  |  |  |  |
Gross property plant and equipment | 908 |  | 908 |  | 895 |
Changes in plant turnaround activity |  |  |  |  |  |
Long-lived and intangible asset impairment | 5 |  |  |  |  |
Construction in progress |  |  |  |  |  |
Property, Plant and Equipment-Net |  |  |  |  |  |
Gross property plant and equipment | 195 |  | 195 |  | $ 275 |
Changes in plant turnaround activity |  |  |  |  |  |
Long-lived and intangible asset impairment | 8 |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |
Changes in plant turnaround activity |  |  |  |  |  |
Long-lived and intangible asset impairment |  |  | 182 |  |  |
Property, plant and equipment | U.K. |  |  |  |  |  |
Changes in plant turnaround activity |  |  |  |  |  |
Long-lived assets | $ 390 |  | $ 390 |  |  |

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