Consolidated Statement of Capitalization - Long-Term Debt - CECONY - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Long-term debt		$ 22,240	$ 23,441
Unamortized debt expense		(162)	(172)
Unamortized debt discount		(60)	(51)
Less: Long-term debt due within one year		251	1,002
LONG-TERM DEBT		21,989	22,439
TOTAL CAPITALIZATION		43,085	40,834
CECONY
Long-term debt		21,060	19,080
Unamortized debt expense		(155)	(145)
Unamortized debt discount		(60)	(50)
Less: Long-term debt due within one year		250	0
LONG-TERM DEBT		20,810	19,080
TOTAL CAPITALIZATION		39,956	35,958
Debentures
Long-term debt		21,950	20,550
Debentures | CECONY
Long-term debt		20,825	18,825
Tax-Exempt Debt | CECONY
Long-term debt		$ 450	450
Debenture 2014B, 3.30 Percent, Due 2024 | Debentures
Interest Rate		3.30%
Long-term debt		$ 250	250
Debenture 2014B, 3.30 Percent, Due 2024 | Debentures | CECONY
Interest Rate		3.30%
Long-term debt		$ 250	250
Debenture Series 2016B, 2.90% Due 2026 | Debentures
Interest Rate		2.90%
Long-term debt		$ 250	250
Debenture Series 2016B, 2.90% Due 2026 | Debentures | CECONY
Interest Rate		2.90%
Long-term debt		$ 250	250
Debenture Series 2017B, 3.125% Due 2027 | Debentures
Interest Rate		3.125%
Long-term debt		$ 350	350
Debenture Series 2017B, 3.125% Due 2027 | Debentures | CECONY
Interest Rate		3.125%
Long-term debt		$ 350	350
Debenture Series 2018A, 3.80% Due 2028 | Debentures
Interest Rate		3.80%
Long-term debt		$ 300	300
Debenture Series 2018A, 3.80% Due 2028 | Debentures | CECONY
Interest Rate		3.80%
Long-term debt		$ 300	300
Debenture Series 2018D, 4.00% Due 2028 | Debentures
Interest Rate		4.00%
Long-term debt		$ 500	500
Debenture Series 2018D, 4.00% Due 2028 | Debentures | CECONY
Interest Rate		4.00%
Long-term debt		$ 500	500
Debenture 2020A, 3.35 Percent, Due 2030 | Debentures
Interest Rate		3.35%
Long-term debt		$ 600	600
Debenture 2020A, 3.35 Percent, Due 2030 | Debentures | CECONY
Interest Rate		3.35%
Long-term debt		$ 600	600
Debenture 2021A, 2.40 Percent, Due 2031 | Debentures
Interest Rate		2.40%
Long-term debt		$ 900	900
Debenture 2021A, 2.40 Percent, Due 2031 | Debentures | CECONY
Interest Rate		2.40%
Long-term debt		$ 900	900
Debenture Series 2003A, 5.875% Due 2033 | Debentures
Interest Rate		5.875%
Long-term debt		$ 175	175
Debenture Series 2003A, 5.875% Due 2033 | Debentures | CECONY
Interest Rate		5.875%
Long-term debt		$ 175	175
Debenture Series 2003C, 5.10% Due 2033 | Debentures
Interest Rate		5.10%
Long-term debt		$ 200	200
Debenture Series 2003C, 5.10% Due 2033 | Debentures | CECONY
Interest Rate		5.10%
Long-term debt		$ 200	200
Debenture Series 2023A, 5.20% Due 2033 | Debentures
Interest Rate		5.20%
Long-term debt		$ 500	0
Debenture Series 2023A, 5.20% Due 2033 | Debentures | CECONY
Interest Rate		5.20%
Long-term debt		$ 500	0
Debenture Series 2004B, 5.70% Due 2034 | Debentures
Interest Rate		5.70%
Long-term debt		$ 200	200
Debenture Series 2004B, 5.70% Due 2034 | Debentures | CECONY
Interest Rate		5.70%
Long-term debt		$ 200	200
Debenture Series 2023B, 5.50% Due 2034 | Debentures
Interest Rate		5.50%
Long-term debt		$ 600	0
Debenture Series 2023B, 5.50% Due 2034 | Debentures | CECONY
Interest Rate		5.50%
Long-term debt		$ 600	0
Debenture Series 2005A, 5.30% Due 2035 | Debentures
Interest Rate		5.30%
Long-term debt		$ 350	350
Debenture Series 2005A, 5.30% Due 2035 | Debentures | CECONY
Interest Rate		5.30%
Long-term debt		$ 350	350
Debenture Series 2005B, 5.25% Due 2035 | Debentures
Interest Rate		5.25%
Long-term debt		$ 125	125
Debenture Series 2005B, 5.25% Due 2035 | Debentures | CECONY
Interest Rate		5.25%
Long-term debt		$ 125	125
Debenture Series 2006A, 5.85% Due 2036 | Debentures
Interest Rate		5.85%
Long-term debt		$ 400	400
Debenture Series 2006A, 5.85% Due 2036 | Debentures | CECONY
Interest Rate		5.85%
Long-term debt		$ 400	400
Debenture Series 2006B, 6.20% Due 2036 | Debentures
Interest Rate		6.20%
Long-term debt		$ 400	400
Debenture Series 2006B, 6.20% Due 2036 | Debentures | CECONY
Interest Rate		6.20%
Long-term debt		$ 400	400
Debenture Series 2006E, 5.70% Due 2036 | Debentures
Interest Rate		5.70%
Long-term debt		$ 250	250
Debenture Series 2006E, 5.70% Due 2036 | Debentures | CECONY
Interest Rate		5.70%
Long-term debt		$ 250	250
Debenture Series 2007A, 6.30% Due 2037 | Debentures
Interest Rate		6.30%
Long-term debt		$ 525	525
Debenture Series 2007A, 6.30% Due 2037 | Debentures | CECONY
Interest Rate		6.30%
Long-term debt		$ 525	525
Debenture 2008B, 6.75 Percent, Due 2038 | Debentures
Interest Rate		6.75%
Long-term debt		$ 600	600
Debenture 2008B, 6.75 Percent, Due 2038 | Debentures | CECONY
Interest Rate		6.75%
Long-term debt		$ 600	600
Debenture 2009C, 5.50 Percent, Due 2039 | Debentures
Interest Rate		5.50%
Long-term debt		$ 600	600
Debenture 2009C, 5.50 Percent, Due 2039 | Debentures | CECONY
Interest Rate		5.50%
Long-term debt		$ 600	600
Debenture 2010B, 5.70 Percent, Due 2040 | Debentures
Interest Rate		5.70%
Long-term debt		$ 350	350
Debenture 2010B, 5.70 Percent, Due 2040 | Debentures | CECONY
Interest Rate		5.70%
Long-term debt		$ 350	350
Debenture 2012A, 4.20 Percent, Due 2042 | Debentures
Interest Rate		4.20%
Long-term debt		$ 400	400
Debenture 2012A, 4.20 Percent, Due 2042 | Debentures | CECONY
Interest Rate		4.20%
Long-term debt		$ 400	400
Debenture 2013A, 3.95 Percent, Due 2043 | Debentures
Interest Rate		3.95%
Long-term debt		$ 700	700
Debenture 2013A, 3.95 Percent, Due 2043 | Debentures | CECONY
Interest Rate		3.95%
Long-term debt		$ 700	700
Debenture 2014A, 4.45 Percent, Due 2044 | Debentures
Interest Rate		4.45%
Long-term debt		$ 850	850
Debenture 2014A, 4.45 Percent, Due 2044 | Debentures | CECONY
Interest Rate		4.45%
Long-term debt		$ 850	850
Debenture 2015A, 4.50 Percent, Due 2045 | Debentures
Interest Rate		4.50%
Long-term debt		$ 650	650
Debenture 2015A, 4.50 Percent, Due 2045 | Debentures | CECONY
Interest Rate		4.50%
Long-term debt		$ 650	650
Debenture 2016A, 3.85 Percent, Due 2046 | Debentures
Interest Rate		3.85%
Long-term debt		$ 550	550
Debenture 2016A, 3.85 Percent, Due 2046 | Debentures | CECONY
Interest Rate		3.85%
Long-term debt		$ 550	550
Debenture Series 2017A, 3.875% Due 2047 | Debentures
Interest Rate		3.875%
Long-term debt		$ 500	500
Debenture Series 2017A, 3.875% Due 2047 | Debentures | CECONY
Interest Rate		3.875%
Long-term debt		$ 500	500
Debenture Series 2018E, 4.65% Due 2048 | Debentures
Interest Rate		4.65%
Long-term debt		$ 600	600
Debenture Series 2018E, 4.65% Due 2048 | Debentures | CECONY
Interest Rate		4.65%
Long-term debt		$ 600	600
Debenture 2019A, 4.125 Percent, Due 2049 | Debentures
Interest Rate		4.125%
Long-term debt		$ 700	700
Debenture 2019A, 4.125 Percent, Due 2049 | Debentures | CECONY
Interest Rate		4.125%
Long-term debt		$ 700	700
Debenture 2020B, 3.95 Percent, Due 2050 | Debentures
Interest Rate		3.95%
Long-term debt		$ 1,000	1,000
Debenture 2020B, 3.95 Percent, Due 2050 | Debentures | CECONY
Interest Rate		3.95%
Long-term debt		$ 1,000	1,000
Debenture 2021C, 3.200 Percent, Due 2051 | Debentures | CECONY
Interest Rate		3.20%
Long-term debt		$ 600	600
Debenture 2022A, 6.15%, Due 2052 | Debentures
Interest Rate		6.15%
Long-term debt		$ 700	700
Debenture 2022A, 6.15%, Due 2052 | Debentures | CECONY
Interest Rate		6.15%
Long-term debt		$ 700	700
Debenture 2023C, 5.90%, Due 2053 | Debentures
Interest Rate		5.90%
Long-term debt		$ 900	0
Debenture 2023C, 5.90%, Due 2053 | Debentures | CECONY
Interest Rate		5.90%
Long-term debt		$ 900	0
Debenture Series 2014C, 4.625% Due 2054 | Debentures
Interest Rate		4.625%
Long-term debt		$ 750	750
Debenture Series 2014C, 4.625% Due 2054 | Debentures | CECONY
Interest Rate		4.625%
Long-term debt		$ 750	750
Debenture Series 2016C, 4.30% Due 2056 | Debentures
Interest Rate		4.30%
Long-term debt		$ 500	500
Debenture Series 2016C, 4.30% Due 2056 | Debentures | CECONY
Interest Rate		4.30%
Long-term debt		$ 500	500
Debenture Series 2017C, 4.00% Due 2057 | Debentures
Interest Rate		4.00%
Long-term debt		$ 350	350
Debenture Series 2017C, 4.00% Due 2057 | Debentures | CECONY
Interest Rate		4.00%
Long-term debt		$ 350	350
Debenture Series 2018B, 4.50% Due 2058 | Debentures
Interest Rate		4.50%
Long-term debt		$ 700	700
Debenture Series 2018B, 4.50% Due 2058 | Debentures | CECONY
Interest Rate		4.50%
Long-term debt		$ 700	700
Debenture 2019B, 3.70 Percent, Due 2059 | Debentures
Interest Rate		3.70%
Long-term debt		$ 600	600
Debenture 2019B, 3.70 Percent, Due 2059 | Debentures | CECONY
Interest Rate		3.70%
Long-term debt		$ 600	600
Debenture 2020C, 3.00 Percent, Due 2060 | Debentures
Interest Rate		3.00%
Long-term debt		$ 600	600
Debenture 2020C, 3.00 Percent, Due 2060 | Debentures | CECONY
Interest Rate		3.00%
Long-term debt		$ 600	600
Debenture 2021B, 3.60 Percent, Due 2061 | Debentures
Interest Rate		3.60%
Long-term debt		$ 750	750
Debenture 2021B, 3.60 Percent, Due 2061 | Debentures | CECONY
Interest Rate		3.60%
Long-term debt		$ 750	750
Tax Exempt Debt Series 2010A Due 2036 | Tax-Exempt Debt
Interest Rate	[1]	3.92%
Tax Exempt Debt Series 2010A Due 2036 | Tax-Exempt Debt | CECONY
Interest Rate	[2]	3.92%
Long-term debt	[2]	$ 225	225
Tax Exempt Debt Series 2004C, 1.663% Due 2039 | Tax-Exempt Debt
Interest Rate	[1]	3.83%
Tax Exempt Debt Series 2004C, 1.663% Due 2039 | Tax-Exempt Debt | CECONY
Interest Rate	[2]	3.83%
Long-term debt	[2]	$ 99	99
Tax-Exempt Debt Series 2005A, 1.627% Due 2039 | Tax-Exempt Debt
Interest Rate	[1]	3.80%
Tax-Exempt Debt Series 2005A, 1.627% Due 2039 | Tax-Exempt Debt | CECONY
Interest Rate	[2]	3.80%
Long-term debt	[2]	$ 126	$ 126

[1] Rates reset weekly; December 31, 2023 rates shown.

[2] Rates reset weekly; December 31, 2023 rates shown.