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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of inventories | Inventories consisted of the following:
| December 31,
(in millions) | 2021 |  | 2020
Finished goods | $ | 215 |  |  | $ | 133 |
Raw materials | 177 |  |  | 83 |
In-process inventories | 20 |  |  | 16 |
Parts and supplies | 72 |  |  | 66 |
Total inventories | $ | 484 |  |  | $ | 298 |
Schedule of lives used in computing depreciation for depreciable assets and components of property, plant and equipment, net | The lives used in computing depreciation for significant asset classes are as follows:
Asset |  | Range of Useful Lives, in Years
Land and improvements |  | 10 to 30
Buildings and improvements |  | 1 to 30
Machinery and equipment |  | 1 to 30
Furniture and fixtures |  | 3 to 10
Right-of-use (“ROU”) finance leases |  | 3 to 18
Other |  | 5 to 30
Property, plant and equipment, net consisted of the following:
| December 31,
(in millions) | 2021 |  | 2020
Machinery and equipment | $ | 4,033 |  |  | $ | 3,881 |
Buildings and improvements | 88 |  |  | 88 |
ROU finance leases | 81 |  |  | 80 |
Land and improvements | 71 |  |  | 47 |
Furniture and fixtures | 37 |  |  | 38 |
Construction in progress | 142 |  |  | 100 |
Other | 15 |  |  | 15 |
| 4,467 |  |  | 4,249 |
Less: Accumulated depreciation | (2,194) |  |  | (2,009) |
Total property, plant and equipment, net | $ | 2,273 |  |  | $ | 2,240 |

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