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Debt (2018 Revolving Credit Facility - Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2018
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Subsidiary ownership   100.00%  
Letters of credit   $ 147,000,000  
Debt instrument, excluding current maturities, gross     $ 5,234,000,000
Long-term debt      
Debt Instrument [Line Items]      
Debt instrument, excluding current maturities, gross   4,927,000,000  
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  
Aggregate commitment   2,000,000,000  
Limit on securing indebtedness $ 2,000,000,000    
Percentage of consolidated net tangible assets 25.00%    
Minimum interest coverage ratio 1.00    
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, excluding current maturities, gross   $ 174,000,000 $ 460,000,000
After June 30, 2020 | Long-term debt | 2018 revolving credit facility due April 2024 | Maximum      
Debt Instrument [Line Items]      
Leverage ratio 4.00