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Organization and Basis of Presentation (Details) customer in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) customer transmission_center company mi MW | Mar. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |
Length of transmission lines | mi | 24,500 |
Number of regional transmission centers | transmission_center | 2 |
Capitalized cost of equity | $ 11,000,000 | $ 13,000,000
Capitalized interest | $ 7,000,000 | $ 5,000,000
Regulated Distribution |  |
Property, Plant and Equipment [Line Items] |  |
Number of existing utility operating companies | company | 10 |
Number of customers served by utility operating companies | customer | 6 |
Plant capacity (in MW's) | MW | 3,790 |
Term Loan | $750 Million Term Loan |  |
Property, Plant and Equipment [Line Items] |  |
Face amount of debt | $ 750,000,000 |
Line of Credit | Revolving Credit Facility |  |
Property, Plant and Equipment [Line Items] |  |
Maximum amount borrowed under revolving credit facility | $ 3,500,000,000.0 |

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