Related Party Transactions - Schedule of Costs of Administrative and Other Services Provided and Received (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Related Party Transaction [Line Items]
Cost of services provided	$ 4,069	$ 3,595	$ 9,164	$ 8,393
Cost of services received	3,517	3,240	7,434	6,913
CECONY
Related Party Transaction [Line Items]
Cost of services provided	3,805	3,340	8,459	7,782
Cost of services received	3,266	2,993	6,813	6,368
CECONY \| Related Party
Related Party Transaction [Line Items]
Cost of services provided	43	37	81	77
Cost of services received	$ 22	$ 22	$ 43	$ 42

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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+ Details

- 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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+ Details