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Basis of Presentation and Significant Accounting Policies - Concentrations of Credit Risk (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Credit Losses |  |
Contractual life of accounts receivable | 30 days |
Period for analyzing historical loss data to determine loss experience | 2 years |
Trade Receivables | Credit Concentration Risk | Chevron, U.S.A. Inc. |  |
Credit Losses |  |
Concentration risk (as a percent) | 14.00% | 14.00%
Trade Receivables | Credit Concentration Risk | Williams Partners |  |
Credit Losses |  |
Concentration risk (as a percent) | 10.00% | 10.00%

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