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Acquisitions and Divestitures - Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Payments to acquire businesses     $ 310 $ 50 $ 0
Crude Oil Terminal          
Business Acquisition [Line Items]          
Cash consideration   $ 44      
FM Gathering LLC          
Business Acquisition [Line Items]          
Payments to acquire businesses $ 300        
Property and equipment acquired     115    
Intangible assets acquired     $ 187    
FM Gathering LLC | Minimum | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow          
Business Acquisition [Line Items]          
Discount rate, intangible assets, estimate of risk, theoretical market participant     18.00%    
FM Gathering LLC | Maximum | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow          
Business Acquisition [Line Items]          
Discount rate, intangible assets, estimate of risk, theoretical market participant     19.00%