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Debt (2018 Revolving Credit Facility - Narrative) (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2020
bbl
Apr. 30, 2018
USD ($)
Mar. 31, 2020
USD ($)
Apr. 28, 2020
USD ($)
Apr. 13, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Subsidiary ownership     100.00%      
Letters of credit     $ 172,000,000      
Debt instrument     2,297,000,000     $ 2,262,000,000
Subsequent event            
Debt Instrument [Line Items]            
Barrels of oil Curtailed due to force majure | bbl 3,200          
Letters of credit       $ 150,000,000    
Long-term debt | 2018 revolving credit facility due April 2024            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 3,500,000,000        
Current borrowing capacity     2,100,000,000      
Aggregate bank commitment     2,000,000,000.0      
Limit on securing indebtedness   $ 2,000,000,000.0        
Percentage of consolidated net tangible assets   25.00%        
Minimum interest coverage ratio   1.00        
Long-term debt | 2018 revolving credit facility due April 2024 | Subsequent event            
Debt Instrument [Line Items]            
Current borrowing capacity         $ 1,800,000,000  
Long-term debt | 2018 revolving credit facility due April 2024 | Maximum            
Debt Instrument [Line Items]            
Leverage ratio, percentage of credit limit   10.00%        
Leverage ratio, amount of credit limit   $ 150,000,000        
Long-term debt | 2018 revolving credit facility due April 2024 | Eurodollar | Minimum            
Debt Instrument [Line Items]            
Basis points   1.50%        
Long-term debt | 2018 revolving credit facility due April 2024 | Eurodollar | Maximum            
Debt Instrument [Line Items]            
Basis points   2.50%        
Long-term debt | 2018 revolving credit facility due April 2024 | Base Rate | Minimum            
Debt Instrument [Line Items]            
Basis points   0.50%        
Long-term debt | 2018 revolving credit facility due April 2024 | Base Rate | Maximum            
Debt Instrument [Line Items]            
Basis points   1.50%        
Line of Credit | 2018 Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument     $ 149,000,000      
June 30, 2018 Through March 31, 2019 | Long-term debt | 2018 revolving credit facility due April 2024 | Maximum            
Debt Instrument [Line Items]            
Leverage ratio   4.50        
June 30, 2019 Through March 31, 2020 | Long-term debt | 2018 revolving credit facility due April 2024 | Maximum            
Debt Instrument [Line Items]            
Leverage ratio   4.25        
After June 30, 2020 | Long-term debt | 2018 revolving credit facility due April 2024 | Maximum            
Debt Instrument [Line Items]            
Leverage ratio   4.00