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Other Contingencies and Commitments (Details) | Sep. 30, 2020 legal_matter | Dec. 31, 2009 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |  |
Indemnifications acquirer environmental liabilities max obligation | $ |  | $ 200,000,000
Louisiana | All Companies Served With Claim |  |
Reserve Quantities [Line Items] |  |
Pending lawsuits and claims (in number of claims) | 43 |
Louisiana | Chevron U.S.A. Inc. |  |
Reserve Quantities [Line Items] |  |
Pending lawsuits and claims (in number of claims) | 39 |

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