Consolidated Statement of Capitalization - USD ($) shares in Millions, $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Capitalization, Equity [Line Items]
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	354	342
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	$ 20,032	$ 18,872
Pension plan liability adjustments, net of taxes	7	(23)
Unrealized gains/(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)	(2)
TOTAL ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES	5	(25)
Equity	20,037	18,847
Noncontrolling interest	299	218
TOTAL EQUITY (See Statement of Equity)	$ 20,336	$ 19,065
CECONY
Schedule of Capitalization, Equity [Line Items]
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	235	235
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	$ 16,312	$ 14,856
Pension plan liability adjustments, net of taxes	1	(5)
Unrealized gains/(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	(1)	(2)
TOTAL ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES	0	(7)
Equity	16,312	14,849
TOTAL SHAREHOLDER’S EQUITY (See Statement of Shareholder’s Equity)	$ 16,312	$ 14,849