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Transactions with Affiliates (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
employee
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
employee
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Related Party Transaction [Line Items]            
Advances to affiliate   $ 248,656   $ 248,656   $ 201,265
Related party transaction, rate       0.05%    
Entity number of employees | employee   0   0    
Related party transaction, expenses from transactions with related party   $ 23,100 $ 26,800 $ 45,800 $ 48,900  
Cash distributions to parent       88,000 46,000  
Subsequent Event [Member]            
Related Party Transaction [Line Items]            
Cash distributions to parent $ 36,000          
Williams Companies Inc [Member]            
Related Party Transaction [Line Items]            
Advances to affiliate   248,700   248,700   $ 201,300
Interest Income, Related Party   $ 100 $ 1,200 $ 600 $ 2,200