Income Tax - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Taxes Disclosure [Line Items]
Income Tax Expense	$ 50,000,000	$ (10,000,000)	$ 292,000,000	$ 174,000,000
Accrued income taxes	73,000,000	73,000,000	73,000,000	73,000,000
Deferred tax assets	23,000,000	23,000,000	23,000,000	23,000,000
Estimated liability for uncertain tax positions	11,000,000		11,000,000
Unrecognized tax benefits, increase resulting from current period tax positions	2,000,000
Unrecognized tax benefits, net	10,000,000		10,000,000
Unrecognized tax benefits, interest expenses	0	0	0	0
Unrecognized tax benefits penalties	0	0	0	0
Subsidiaries | CECONY
Income Taxes Disclosure [Line Items]
Income Tax Expense	48,000,000	1,000,000	275,000,000	182,000,000
Accrued income taxes	88,000,000	88,000,000	88,000,000	88,000,000
Deferred tax assets	19,000,000	$ 19,000,000	19,000,000	$ 19,000,000
Estimated liability for uncertain tax positions	$ 7,000,000		$ 7,000,000