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General (Details)
1 Months Ended 9 Months Ended 12 Months Ended
May 31, 2008
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Sep. 27, 2019
USD ($)
Aug. 08, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Noncontrolling Interest [Line Items]                
Number of reporting segments | segment   4            
Interest paid   $ 610,000,000 $ 298,000,000          
Cash and cash equivalents   4,840,000,000         $ 3,033,000,000  
Restricted cash and restricted cash equivalents   454,000,000         0  
Cash and restricted cash included in assets held for sale   16,000,000            
Restricted cash and restricted cash equivalents included in long-term receivables and other assets, net   55,000,000            
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents   5,365,000,000 2,954,000,000       $ 3,033,000,000 $ 1,672,000,000
Foreign and State                
Noncontrolling Interest [Line Items]                
Income taxes paid   751,000,000 838,000,000          
State                
Noncontrolling Interest [Line Items]                
Domestic tax refunds   2,000,000 2,000,000          
Federal                
Noncontrolling Interest [Line Items]                
Income taxes paid   $ 0 $ 0          
Western Midstream Operating, LP                
Noncontrolling Interest [Line Items]                
Ownership interest   2.00%            
WES Midstream                
Noncontrolling Interest [Line Items]                
Ownership interest   55.40%            
WES Midstream | Western Midstream Operating, LP                
Noncontrolling Interest [Line Items]                
Ownership interest   98.00%            
Public Ownership | WES Midstream                
Noncontrolling Interest [Line Items]                
Ownership interest   44.60%            
Anadarko | Western Midstream Operating, LP                
Noncontrolling Interest [Line Items]                
Note receivable $ 260,000,000              
Notes Payable | Western Midstream Operating, LP                
Noncontrolling Interest [Line Items]                
Debt instrument term 30 years              
Fixed annual rate, payable quarterly 6.50%              
Mozambique LNG Assets | Discontinued Operations, Disposed of by Sale                
Noncontrolling Interest [Line Items]                
Discontinued operations, consideration receivable         $ 4,200,000,000      
Anadarko                
Noncontrolling Interest [Line Items]                
Domestic tax refunds       $ 881,000,000        
Anadarko | Africa Assets | Discontinued Operations, Held-for-sale                
Noncontrolling Interest [Line Items]                
Discontinued operations, consideration receivable           $ 8,800,000,000