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Basis of Presentation and Significant Accounting Policies - Concentrations of Credit Risk (Details)
12 Months Ended
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%