Consolidated Statement of Cash Flows - CECONY - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net income for common stock	$ 2,519	$ 1,660	$ 1,346
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	2,031	2,056	2,032
Deferred income taxes	132	435	133
Rate case amortization and accruals	92	73	(16)
Other non-cash items, net	(90)	90	127
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable	(275)	(285)	(411)
Allowance for uncollectible accounts – customers	38	5	169
Materials and supplies, including fuel oil and gas in storage	38	(111)	(82)
Revenue decoupling mechanism receivable	(39)	26	(53)
Other receivables and other current assets	141	(21)	(157)
Unbilled revenue and net unbilled revenue deferrals	(48)	(96)	(53)
Prepayments	(200)	26	(24)
Accounts payable	(285)	558	44
Pensions and retiree benefits obligations, net	(201)	176	266
Pensions and retiree benefits contributions	(33)	(39)	(472)
Superfund and environmental remediation costs	(12)	(22)	(10)
Accrued taxes	(13)	7	(46)
Accrued interest	(7)	42	4
Deferred charges, noncurrent assets, leases, net and other regulatory assets	(1,216)	(870)	(496)
Deferred credits, noncurrent liabilities and other regulatory liabilities	196	445	258
Other current liabilities	213	1	(81)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,156	3,935	2,733
INVESTING ACTIVITIES
Utility construction expenditures	(4,353)	(3,824)	(3,630)
Cost of removal less salvage	(387)	(337)	(323)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,003)	(4,565)	(3,484)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	(752)	1,702	(382)
Issuance of long-term debt	2,050	800	2,804
Retirement of long-term debt	(710)	(406)	(1,960)
Debt issuance costs	(32)	(13)	(40)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES	(1,488)	1,014	461
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(335)	384	(290)
BALANCE AT BEGINNING OF PERIOD	1,530	1,146	1,436
BALANCE AT END OF PERIOD	1,195	1,530	1,146
Cash paid during the period for:
Interest	987	900	924
Income taxes	397	47	9
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	598	681	457
CECONY
OPERATING ACTIVITIES
Net income for common stock	1,606	1,390	1,344
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,924	1,778	1,705
Deferred income taxes	556	85	124
Rate case amortization and accruals	72	55	(16)
Other non-cash items, net	(40)	148	30
CHANGES IN ASSETS AND LIABILITIES
Allowance for uncollectible accounts – customers	39	10	166
Materials and supplies, including fuel oil and gas in storage	18	(71)	(78)
Revenue decoupling mechanism receivable	(26)	27	(62)
Other receivables and other current assets	(136)	111	(161)
Unbilled revenue and net unbilled revenue deferrals	(47)	(28)	(16)
Prepayments	(106)	(11)	(53)
Accounts payable	(137)	322	65
Accounts payable to affiliated companies	(1)	(1)	(4)
Pensions and retiree benefits obligations, net	(204)	182	283
Pensions and retiree benefits contributions	(33)	(26)	(433)
Superfund and environmental remediation costs	(12)	(20)	(18)
Accrued interest	25	7	1
Deferred charges, noncurrent assets, leases, net and other regulatory assets	(1,158)	(852)	(484)
Deferred credits, noncurrent liabilities and other regulatory liabilities	199	332	210
Other current liabilities	239	7	(56)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,285	3,263	2,186
INVESTING ACTIVITIES
Utility construction expenditures	(4,059)	(3,596)	(3,413)
Cost of removal less salvage	(380)	(330)	(316)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(4,439)	(3,926)	(3,729)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	(397)	939	(299)
Issuance of long-term debt	2,000	700	2,250
Retirement of long-term debt	0	0	(640)
Debt issuance costs	(31)	(12)	(27)
Capital contribution by Con Edison	1,720	150	1,100
Dividend to Con Edison	(1,056)	(978)	(988)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES	2,236	799	1,396
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	82	136	(147)
BALANCE AT BEGINNING OF PERIOD	1,056	920	1,067
BALANCE AT END OF PERIOD	1,138	1,056	920
Cash paid during the period for:
Interest	882	755	739
Income taxes	(27)	87	5
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	564	561	406
CECONY | Nonrelated Party
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable	(270)	(268)	(412)
Accrued taxes	(35)	15	(54)
CECONY | Related Party
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable	(100)	(8)	96
Accrued taxes	(88)	79	9
Software Licenses
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	0	2	23
Software Licenses | CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	0	2	22
Equipment
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	11	17	22
Equipment | CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	$ 11	$ 17	$ 22