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General (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2016
Dec. 31, 2019
Aug. 08, 2019
Dec. 31, 2018
Noncontrolling Interest [Line Items]            
Anadarko acquisition-related costs $ 148 $ 0        
Income taxes paid 111 223        
Domestic tax refunds 26 1        
Interest paid 572 114        
Cash and cash equivalents 2,021     $ 3,032    
Restricted cash and restricted cash equivalents 242     480    
Cash and restricted cash included in assets held for sale 27          
Restricted cash and restricted cash equivalents included in long-term receivables and other assets, net 74          
Cash, cash equivalents, restricted cash, and restricted cash equivalents 2,364 $ 1,752   3,574   $ 3,033
Equity method investment amounts 6,050     6,389    
WES Midstream segment            
Noncontrolling Interest [Line Items]            
Equity method investment amounts 4,800     $ 5,100    
Impairment of equity method investment 400          
WES            
Noncontrolling Interest [Line Items]            
Sales 113          
WES | Commodities            
Noncontrolling Interest [Line Items]            
Purchases 219          
WES | Services            
Noncontrolling Interest [Line Items]            
Purchases 310          
Anadarko            
Noncontrolling Interest [Line Items]            
Anadarko acquisition-related costs 148          
Domestic tax refunds $ 881   $ 881      
Anadarko | Africa Assets | Discontinued Operations, Held-for-sale            
Noncontrolling Interest [Line Items]            
Discontinued operations, consideration receivable         $ 8,800