Financial Information by Business Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 15,670	$ 13,676	$ 12,246
Depreciation and amortization	2,056	2,032	1,920
Operating income	2,624	2,826	2,654
Other Income (deductions)	326	(538)	(401)
Interest charges	852	905	1,019
Income taxes on operating income	422	340	193
Total assets	69,065	63,116	62,895
Capital expenditures	4,465	3,964	4,085
Income tax expense (benefit) on non-operating income	76	(150)	(103)
CECONY
Segment Reporting Information [Line Items]
Revenues	13,268	11,716	10,647
Depreciation and amortization	1,778	1,705	1,598
Operating income	2,135	2,460	2,310
Other Income (deductions)	332	(108)	(171)
Total assets	57,445	52,655
Income tax expense (benefit) on non-operating income	(6)	(6)	(3)
Operating segment | Clean Energy Businesses
Segment Reporting Information [Line Items]
Revenues	1,319	1,022	736
Depreciation and amortization	178	231	231
Operating income	368	236	215
Other Income (deductions)	3	(10)	4
Interest charges	(35)	68	196
Income taxes on operating income	84	44	(43)
Total assets	7,224	6,554	6,848
Capital expenditures	399	298	616
Operating segment | Con Edison Transmission
Segment Reporting Information [Line Items]
Revenues	4	4	4
Depreciation and amortization	1	1	1
Operating income	(10)	(16)	(8)
Other Income (deductions)	19	(407)	(215)
Interest charges	5	9	18
Income taxes on operating income	1	3	0
Total assets	314	249	1,348
Capital expenditures	65	31	3
Operating segment | CECONY
Segment Reporting Information [Line Items]
Revenues	13,268	11,716	10,647
Depreciation and amortization	1,778	1,705	1,598
Operating income	2,135	2,460	2,310
Other Income (deductions)	332	(108)	(171)
Interest charges	822	762	739
Income taxes on operating income	261	252	218
Total assets	57,445	52,655	50,967
Capital expenditures	3,758	3,418	3,246
Operating segment | CECONY | Electric
Segment Reporting Information [Line Items]
Revenues	9,751	8,806	8,103
Depreciation and amortization	1,315	1,286	1,214
Operating income	1,496	1,802	1,731
Other Income (deductions)	259	(84)	(134)
Interest charges	582	542	535
Income taxes on operating income	138	151	130
Total assets	39,153	36,260	35,673
Capital expenditures	2,522	2,189	2,080
Operating segment | CECONY | Gas
Segment Reporting Information [Line Items]
Revenues	2,924	2,378	2,036
Depreciation and amortization	367	326	294
Operating income	660	646	574
Other Income (deductions)	52	(16)	(25)
Interest charges	198	179	164
Income taxes on operating income	141	110	102
Total assets	15,361	13,748	12,678
Capital expenditures	1,128	1,126	1,044
Operating segment | CECONY | Steam
Segment Reporting Information [Line Items]
Revenues	593	532	508
Depreciation and amortization	96	93	90
Operating income	(21)	12	5
Other Income (deductions)	21	(8)	(12)
Interest charges	42	41	40
Income taxes on operating income	(18)	(9)	(14)
Total assets	2,931	2,647	2,616
Capital expenditures	108	103	122
Operating segment | O&R
Segment Reporting Information [Line Items]
Revenues	1,085	941	862
Depreciation and amortization	98	95	90
Operating income	136	150	147
Other Income (deductions)	23	(12)	(14)
Interest charges	46	42	41
Income taxes on operating income	25	21	21
Total assets	3,511	3,292	3,247
Capital expenditures	243	217	220
Operating segment | O&R | Electric
Segment Reporting Information [Line Items]
Revenues	773	681	629
Depreciation and amortization	71	69	65
Operating income	94	100	99
Other Income (deductions)	17	(8)	(10)
Interest charges	29	27	26
Income taxes on operating income	17	13	13
Total assets	2,247	2,123	2,097
Capital expenditures	167	147	159
Operating segment | O&R | Gas
Segment Reporting Information [Line Items]
Revenues	312	260	233
Depreciation and amortization	27	26	25
Operating income	42	50	48
Other Income (deductions)	6	(4)	(4)
Interest charges	17	15	15
Income taxes on operating income	8	8	8
Total assets	1,264	1,169	1,150
Capital expenditures	76	70	61
Other
Segment Reporting Information [Line Items]
Revenues	(6)	(7)	(3)
Depreciation and amortization	1	0	0
Operating income	(5)	(4)	(10)
Other Income (deductions)	(51)	(1)	(5)
Interest charges	14	24	25
Income taxes on operating income	51	20	(3)
Total assets	571	366	485
Capital expenditures	0	0	0
Other | O&R
Segment Reporting Information [Line Items]
Revenues	0	0	0
Depreciation and amortization	0	0	0
Operating income	0	0	0
Other Income (deductions)	0	0	0
Interest charges	0	0	0
Income taxes on operating income	0	0	0
Total assets	0	0	0
Capital expenditures	0	0	0
Inter- segment revenues
Segment Reporting Information [Line Items]
Revenues	0	0	0
Inter- segment revenues | Clean Energy Businesses
Segment Reporting Information [Line Items]
Revenues	0	0	0
Inter- segment revenues | CECONY
Segment Reporting Information [Line Items]
Revenues	(103)	(100)	(99)
Inter- segment revenues | CECONY | Electric
Segment Reporting Information [Line Items]
Revenues	19	18	18
Inter- segment revenues | CECONY | Gas
Segment Reporting Information [Line Items]
Revenues	8	8	7
Inter- segment revenues | CECONY | Steam
Segment Reporting Information [Line Items]
Revenues	$ 76	$ 74	$ 74