Capitalization - Schedule of Long-Term Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
2024	$ 250
2025	0
2026	250
2027	430
2028	800
Long-term debt	22,240	$ 23,441
Broken Bow II \| Disposal Group, Held-for-sale, Not Discontinued Operations \| Clean Energy Businesses
Debt Instrument [Line Items]
Disposal group, including discontinued operation. Long-term debt, including current maturities	62
CECONY
Debt Instrument [Line Items]
2024	250
2025	0
2026	250
2027	350
2028	800
Long-term debt	$ 21,060	$ 19,080

Disposal Group, Including Discontinued Operation. Long-Term Debt, Including Current Maturities

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