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Commiments and Contingencies Commiments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2022
Legal and Environmental Matters [Abstract] |
Schedule of Loss Contingencies by Contingency [Table Text Block] | We maintain reserves for various contingent liabilities as follows (dollar amounts in millions):
| March 31, 2022 |  | December 31, 2021
Environmental reserves | $ | 24 |  |  | $ | 25 |
Other reserves | — |  |  | — |
Total contingencies | 24 |  |  | 25 |
Current portion (included in Accounts payable and accrued liabilities) | (1) |  |  | (1) |
Long-term portion | $ | 23 |  |  | $ | 24 |

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