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Acquisitions - May 2018 Acquisitions (Details) - USD ($)
$ in Millions
6 Months Ended
May 11, 2018
May 10, 2017
Jun. 30, 2019
May 2018 Acquisition      
Asset Acquisition [Line Items]      
Consideration in excess of the historical carrying value of net assets under common control $ 738    
Historical carrying value of net assets under common control 482    
Consideration transferred $ 1,220    
May 2018 Acquisition | Amberjack Pipeline Company LLC (“Amberjack”) - Series A      
Asset Acquisition [Line Items]      
Percentage of voting interests acquired 75.00%    
May 2018 Acquisition | Amberjack Pipeline Company LLC (“Amberjack”) - Series B      
Asset Acquisition [Line Items]      
Percentage of voting interests acquired 50.00%    
Revolving Credit Facility | Five Year Revolver due July 2023      
Asset Acquisition [Line Items]      
Debt instrument term     5 years
Shell Treasury Center West Inc | Revolving Credit Facility | Five Year Revolver due July 2023 | May 2018 Acquisition      
Asset Acquisition [Line Items]      
Debt instrument term   5 years  
Consideration transferred $ 494    
Shell Treasury Center West Inc | Revolving Credit Facility | Five Year Revolver Due December 2022      
Asset Acquisition [Line Items]      
Debt instrument term     5 years
Shell Treasury Center West Inc | Revolving Credit Facility | Five Year Revolver Due December 2022 | May 2018 Acquisition      
Asset Acquisition [Line Items]      
Debt instrument term   5 years  
Consideration transferred $ 726