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Credit Facilities (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 09, 2020
USD ($)
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 750,000,000      
Debt Instrument, Covenant Description 65.00%      
Ratio of Indebtedness to Net Capital 0.559      
Commercial Paper, Maximum Term 270 days      
Commercial Paper $ 0      
FERC Authorized Short-term Debt, effective through February 6, 2014 900,000,000      
Line of Credit Facility, Amount Outstanding 0      
Line of Credit Facility, Remaining Borrowing Capacity 650,000,000      
letter of credit facility 220,000,000      
Letters of Credit Outstanding, Amount 79,000,000      
Short-term debt 0   $ 150,000,000  
Line of Credit Facility, Current Borrowing Capacity $ 650,000,000      
Term Loan [Member]        
Line of Credit Facility [Line Items]        
Short-term debt   $ 200,000,000   $ 150,000,000