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Acquisitions and Other Transactions - May 2018 Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
May 11, 2018
Dec. 31, 2020
May 2018 Acquisition    
Asset Acquisition [Line Items]    
Consideration transferred $ 1,220  
Consideration in excess of book value of net assets acquired 738  
Equity method investment, aggregate cost 482  
Five Year Revolver due July 2023    
Asset Acquisition [Line Items]    
Debt instrument term   5 years
Five Year Revolver Due December 2022    
Asset Acquisition [Line Items]    
Debt instrument term   5 years
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    
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]    
Consideration transferred $ 494  
Debt instrument term 5 years  
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]    
Consideration transferred $ 726  
Debt instrument term 5 years  
Amberjack Pipeline Company LLC - Series A | May 2018 Acquisition    
Asset Acquisition [Line Items]    
Voting interest acquired 75.00%  
Amberjack Pipeline Company LLC - Series B | May 2018 Acquisition    
Asset Acquisition [Line Items]    
Voting interest acquired 50.00%