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Debt (2018 Revolving Credit Facility - Narrative) (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2018
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Subsidiary ownership   100.00%      
Letters of credit   $ 233,000,000      
Debt instrument   3,038,000,000   $ 3,171,000,000  
Long-term debt          
Debt Instrument [Line Items]          
Debt instrument   2,831,000,000      
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   $ 567,000,000      
After June 30, 2020 | Long-term debt | 2018 revolving credit facility due April 2024 | Maximum          
Debt Instrument [Line Items]          
Leverage ratio     4.00