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Variable Interest Entities (VIEs) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Variable Interest Entity [Line Items]
Operating Revenues	$ 2,889	$ 2,781
Operation and Maintenance	778	754
Long Island ServCo [Member]
Variable Interest Entity [Line Items]
Operating Revenues	123	127
Operation and Maintenance	$ 123	$ 127

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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X

- Definition

Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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