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Debt (2018 Revolving Credit Facility - Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 31, 2020
Apr. 30, 2018
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Subsidiary ownership     100.00%  
Letters of credit     $ 203,000,000  
Debt instrument     2,471,000,000 $ 2,262,000,000
October 2020 Amendment [Member] | Subsequent Event        
Debt Instrument [Line Items]        
Basis points 0.25%      
Limit of unrestricted cash and cash equivalents $ 200,000,000      
Long-term debt | 2018 revolving credit facility due April 2024        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 3,500,000,000    
Current borrowing base     1,800,000,000  
Aggregate commitment     1,800,000,000  
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 base 2,000,000,000.0      
Aggregate commitment $ 2,000,000,000.0      
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   1.75%    
Long-term debt | 2018 revolving credit facility due April 2024 | Eurodollar | Maximum        
Debt Instrument [Line Items]        
Basis points   2.75%    
Long-term debt | 2018 revolving credit facility due April 2024 | Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis points   0.75%    
Long-term debt | 2018 revolving credit facility due April 2024 | Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis points   1.75%    
Line of Credit | 2018 Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument     $ 0  
After June 30, 2020 | Long-term debt | 2018 revolving credit facility due April 2024 | Maximum        
Debt Instrument [Line Items]        
Leverage ratio   4.00