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Debt (2018 Revolving Credit Facility - Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Subsidiary ownership     100.00%    
Letters of credit     $ 233,000,000    
Debt instrument     3,039,000,000   $ 3,171,000,000
Long-term debt          
Debt Instrument [Line Items]          
Debt instrument     2,832,000,000    
Long-term debt | 2018 revolving credit facility due April 2024          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 3,500,000,000        
Current borrowing base       $ 2,000,000,000.0  
Aggregate 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 | 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 | Revolving Credit Facility | 2018 Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt instrument     $ 568,000,000    
After June 30, 2020 | Long-term debt | 2018 revolving credit facility due April 2024 | Maximum          
Debt Instrument [Line Items]          
Leverage ratio   4.00