Consolidated Statement of Capitalization - USD ($) shares in Millions, $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Schedule of Capitalization, Equity [Line Items]
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	333	321
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS	$ 18,041	$ 16,742
Pension plan liability adjustments, net of taxes	(17)	(12)
Unrealized losses on derivatives qualified as cash flow hedges, less reclassification adjustment for gains/(losses) included in net income and reclassification adjustment for unrealized losses included in regulatory assets, net of taxes	(2)	(4)
TOTAL ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAXES	(19)	(16)
Equity	18,022	16,726
Noncontrolling interest	191	113
TOTAL EQUITY (See Statement of Equity)	$ 18,213	$ 16,839
CECONY
Schedule of Capitalization, Equity [Line Items]
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	235	235
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS	$ 14,153	$ 12,915
Unrealized losses on derivatives qualified as cash flow hedges, less reclassification adjustment for gains/(losses) included in net income and reclassification adjustment for unrealized losses included in regulatory assets, net of taxes	(6)	(5)
TOTAL ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAXES	(6)	(5)
Equity	14,147	12,910
TOTAL SHAREHOLDER’S EQUITY (See Statement of Shareholder’s Equity)	$ 14,147	$ 12,910