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Acquisitions, Dispositions, and Other Transactions - Narrative (Details)
ft² in Thousands, $ in Millions
Sep. 23, 2019
USD ($)
Jul. 31, 2019
USD ($)
ft²
Sep. 27, 2019
USD ($)
Mozambique LNG Assets | Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Sale for substantially all of assets, liabilities, businesses, and operations     $ 4,200
Plains All American Pipeline, LP      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of equity method investments $ 646    
Pre-tax gain on sale of pipeline $ 111    
Ecopetrol Joint Venture      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Area of development in joint venture | ft²   97  
Ownership percentage in joint venture   51.00%  
Ecopetrol | Ecopetrol Joint Venture      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Amount due at closing   $ 750  
Carried capital   $ 750  
Minority interest in new venture   49.00%  
Percentage share of capital expenditures   75.00%  
Share of capital expenditures (up to)   $ 750