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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Related Party Transactions - EEGH - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	May 31, 2021	Feb. 28, 2021	Dec. 31, 2020
EEGH
Related Party Transaction [Line Items]
Payments for distributions to affiliates			$ 225,000,000	$ 1,725,000,000
Face amount	$ 650,000,000		650,000,000		$ 2,250,000,000
Affiliated Entity \| EEGH
Related Party Transaction [Line Items]
Expenses from transactions with related parties	8,000,000	$ 37,000,000	15,000,000	80,000,000
Affiliated Entity \| EEGH \| Other Assets Due from Affiliates
Related Party Transaction [Line Items]
Due from affiliates	5,000,000		5,000,000				$ 7,000,000
Dominion Energy, Inc. \| Affiliated Entity \| EEGH
Related Party Transaction [Line Items]
Payments for distributions to affiliates				1,700,000,000
Dominion Energy, Inc. \| Affiliated Entity \| EEGH \| Notes Receivable
Related Party Transaction [Line Items]
Interest income related to affiliated notes receivable		12,000,000		23,000,000
East Ohio \| Affiliated Entity \| EEGH \| Notes Receivable
Related Party Transaction [Line Items]
Interest income related to affiliated notes receivable		$ 15,000,000		$ 33,000,000
Berkshire Hathaway Energy \| Affiliated Entity \| EEGH \| Tax Receivable
Related Party Transaction [Line Items]
Due from affiliates	76,000,000		76,000,000				20,000,000
BHE GT&S, LLC \| Affiliated Entity \| EEGH \| Intercompany Revolving Credit Agreement With BHE GT&S
Related Party Transaction [Line Items]
Maximum borrowing capacity	400,000,000		400,000,000
BHE GT&S, LLC \| Affiliated Entity \| EEGH \| Intercompany Revolving Credit Agreement With BHE GT&S \| Line of Credit
Related Party Transaction [Line Items]
Long-term line of credit	0		0				9,000,000
EEGH \| Affiliated Entity \| BHE GT&S, LLC \| BHE GT&S and Eastern Energy Intercompany Revolving Credit Agreement
Related Party Transaction [Line Items]
Long-term line of credit	16,000,000		16,000,000				124,000,000
Face amount	400,000,000		400,000,000			$ 200,000,000
MidAmerican Energy Company \| Affiliated Entity \| EEGH \| Shared Benefit Plan
Related Party Transaction [Line Items]
Due to related parties, noncurrent	$ 110,000,000		$ 110,000,000				$ 115,000,000