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Commiments and Contingencies Commiments and Contingencies (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total contingencies | $ 13 | $ 13
Accrual for Environmental Loss Contingencies, Gross | 14 | 14
Current portion (included in Accrued liabilities) | (1) | (1)
Long-term portion (included in Other long-term liabilities) | 13 | 13
Environmental reserves |  |
Loss Contingencies [Line Items] |  |
Total contingencies | 14 | 14
Other reserves |  |
Loss Contingencies [Line Items] |  |
Total contingencies | $ 0 | $ 0

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