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Commiments and Contingencies Commiments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2021
Legal and Environmental Matters [Abstract] |
Schedule of Loss Contingencies by Contingency [Table Text Block] | We maintain reserves for various contingent liabilities as follows:
| June 30, 2021 |  | December 31, 2020
Environmental reserves | $ | 14 |  |  | $ | 14 |
Other reserves | — |  |  | — |
Total contingencies | 14 |  |  | 14 |
Current portion (included in Accrued liabilities) | (1) |  |  | (1) |
Long-term portion (included in Other long-term liabilities) | $ | 13 |  |  | $ | 13 |

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