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General - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Disposed of by Sale, Not Discontinued Operations | WES Midstream segment          
Summary of Significant Accounting Policies [Line Items]          
Number of limited partner units sold (in units) 11.5        
Proceeds from sale of limited partner units $ 200        
Gain on sale $ 102        
Discontinued Operations, Held-for-sale | Ghana Operations          
Summary of Significant Accounting Policies [Line Items]          
Income (loss) from discontinued operations   $ 7   $ (35)  
Property, plant and equipment, net   1,200   1,200 $ 1,400
Deferred income taxes, asset retirement obligations and finance lease liability   $ 600   $ 600 $ 670
Discontinued Operations | Ecuador Operations          
Summary of Significant Accounting Policies [Line Items]          
Income (loss) from discontinued operations     $ (403)    
WES Midstream segment          
Summary of Significant Accounting Policies [Line Items]          
Non-voting general partner interest       2.00%  
Limited partner interest       49.10%  
Non-voting limited partner interest       2.00%  
Effective economic interest       51.20%