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Other Investments (Investment in Unconsolidated Entity) (Details) - Mountain Valley Pipeline LLC (Unconsolidated Entity) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Income Statement          
AFUDC $ 117,754,887 $ 66,953,609 $ 227,780,361 $ 121,138,125  
Other Income (Expense), net (34,575) 720,935 699,607 3,283,727  
Net Income 117,720,312 $ 67,674,544 228,479,968 $ 124,421,852  
Assets:          
Current Assets 218,072,899   218,072,899   $ 485,323,892
Construction Work in Progress 5,132,263,805   5,132,263,805   4,675,267,389
Other Assets 5,752,436   5,752,436   13,190,816
Total Assets 5,356,089,140   5,356,089,140   5,173,782,097
Liabilities and Equity:          
Current Liabilities 194,839,985   194,839,985   466,776,233
Noncurrent Liabilities 265,000   265,000   0
Capital 5,160,984,155   5,160,984,155   4,707,005,864
Total Liabilities and Equity $ 5,356,089,140   $ 5,356,089,140   $ 5,173,782,097