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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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Plant Capacity

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