Financial Information by Business Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	$ 15,256	$ 14,663	$ 15,670
Other operations and maintenance	3,751	3,606	3,905
Depreciation and amortization	2,155	2,031	2,056
Other operating expense	6,680	5,830	7,085
Operating income	2,670	3,196	2,624
Other Income (deductions)	655	830	326
Interest Expense	1,250	1,075	888
Allowance for borrowed funds used during construction	(63)	(52)	(36)
Income Tax Expense	318	487	498
Total assets	70,562	66,331	69,065
Capital expenditures	4,728	4,509	4,465
Con Edison Transmission
Segment Reporting Information [Line Items]
Other operations and maintenance	11	11
CECONY
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	14,129	13,476	13,268
Depreciation and amortization	2,037	1,924	1,778
Operating income	2,593	2,177	2,135
Other Income (deductions)	578	732	332
Allowance for borrowed funds used during construction	(58)	(49)	(33)
Total assets	65,650	61,600
Operating segment
Segment Reporting Information [Line Items]
Other operations and maintenance	0	(3)
Operating segment | Clean Energy Businesses
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	0	129	1,319
Other operations and maintenance			503
Depreciation and amortization		0	178
Other operating expense		45	270
Operating income		37	368
Other Income (deductions)		1	3
Interest Expense		16	(35)
Income Tax Expense		3	84
Total assets		0	7,224
Capital expenditures		81	399
Operating segment | Con Edison Transmission
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	4	4	4
Other operations and maintenance			12
Depreciation and amortization	1	1	1
Other operating expense	0	1	1
Operating income	(8)	(9)	(10)
Other Income (deductions)	61	62	19
Interest Expense	0	2	5
Income Tax Expense	8	14	5
Total assets	470	414	314
Capital expenditures	29	49	65
Operating segment | CECONY
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	14,129	13,476	13,268
Other operations and maintenance	3,353	3,176	3,042
Depreciation and amortization	2,037	1,924	1,778
Other operating expense	6,146	6,199	6,313
Operating income	2,593	2,177	2,135
Other Income (deductions)	578	732	332
Interest Expense	1,167	994	855
Allowance for borrowed funds used during construction	(58)	(49)	(33)
Income Tax Expense	314	358	255
Total assets	65,650	61,600	57,445
Capital expenditures	4,374	4,083	3,758
Operating segment | CECONY | Electric
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES		10,078	9,751
Other operations and maintenance	2,622	2,417	2,373
Depreciation and amortization	1,471	1,395	1,315
Other operating expense	4,792	4,698	4,567
Operating income	1,832	1,568	1,496
Other Income (deductions)	441	564	259
Interest Expense	826	708	609
Allowance for borrowed funds used during construction	(41)	(34)	(27)
Income Tax Expense	193	217	134
Total assets	46,275	42,226	39,153
Capital expenditures	3,088	2,909	2,522
Operating segment | CECONY | Gas
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES		2,829	2,924
Other operations and maintenance	528	528	471
Depreciation and amortization	458	429	367
Other operating expense	1,100	1,190	1,426
Operating income	748	682	660
Other Income (deductions)	102	122	52
Interest Expense	287	240	203
Allowance for borrowed funds used during construction	(16)	(13)	(5)
Income Tax Expense	132	159	140
Total assets	16,507	16,343	15,361
Capital expenditures	1,154	1,046	1,128
Operating segment | CECONY | Steam
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES		569	593
Other operations and maintenance	203	231	198
Depreciation and amortization	108	100	96
Other operating expense	254	311	320
Operating income	13	(73)	(21)
Other Income (deductions)	35	46	21
Interest Expense	54	46	43
Allowance for borrowed funds used during construction	(1)	(2)	(1)
Income Tax Expense	(11)	(18)	(19)
Total assets	2,868	3,031	2,931
Capital expenditures	132	128	108
Operating segment | O&R
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	1,125	1,056	1,085
Other operations and maintenance	387	375	352
Depreciation and amortization	117	106	98
Other operating expense	460	449	499
Operating income	161	126	136
Other Income (deductions)	32	49	23
Interest Expense	65	54	49
Allowance for borrowed funds used during construction	(5)	(3)	(3)
Income Tax Expense	29	28	25
Total assets	4,060	3,675	3,511
Capital expenditures	325	296	243
Operating segment | O&R | Electric
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES		759	773
Other operations and maintenance	307	292	275
Depreciation and amortization	82	76	71
Other operating expense	351	306	333
Operating income	112	85	94
Other Income (deductions)	25	37	17
Interest Expense	43	35	32
Allowance for borrowed funds used during construction	(5)	(3)	(3)
Income Tax Expense	24	20	17
Total assets	2,596	2,329	2,247
Capital expenditures	214	211	167
Operating segment | O&R | Gas
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES		297	312
Other operations and maintenance	80	83	77
Depreciation and amortization	35	30	27
Other operating expense	109	143	166
Operating income	49	41	42
Other Income (deductions)	7	12	6
Interest Expense	22	19	17
Income Tax Expense	5	8	8
Total assets	1,464	1,346	1,264
Capital expenditures	111	85	76
Other
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	(2)	(2)	(6)
Other operations and maintenance			(4)
Depreciation and amortization	0	0	1
Other operating expense	74	(864)	2
Operating income	(76)	865	(5)
Other Income (deductions)	(16)	(14)	(51)
Interest Expense	18	9	14
Income Tax Expense	(33)	84	129
Total assets	382	642	571
Capital expenditures	0	0	0
Other | Clean Energy Businesses
Segment Reporting Information [Line Items]
Other operations and maintenance		47
Inter- segment revenues | CECONY
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	(104)	(100)	(103)
Inter- segment revenues | CECONY | Electric
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	20	18	19
Inter- segment revenues | CECONY | Gas
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	9	8	8
Inter- segment revenues | CECONY | Steam
Segment Reporting Information [Line Items]
TOTAL OPERATING REVENUES	$ 75	$ 74	$ 76