Consolidated Statement of Capitalization (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
TOTAL COMMON SHAREHOLDERS' EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS	$ 12,270	$ 11,922
TOTAL COMMON SHAREHOLDERS' EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	292,872,396	292,871,896
Pension plan liability adjustments, net of taxes	(22)	(50)
Unrealized gains/(losses) on derivatives qualified as cash flow hedges, less reclassification adjustment for gains/(losses) included in net income and reclassification adjustment	(3)	(3)
TOTAL ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAXES	(25)	(53)
TOTAL COMMON SHAREHOLDERS' EQUITY (SEE STATEMENT OF COMMON SHAREHOLDER'S EQUITY)	12,245	11,869
CECONY [Member]
TOTAL COMMON SHAREHOLDERS' EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS	10,853	10,561
TOTAL COMMON SHAREHOLDERS' EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	235,488,094	235,488,094
Pension plan liability adjustments, net of taxes	(3)	(6)
Unrealized gains/(losses) on derivatives qualified as cash flow hedges, less reclassification adjustment for gains/(losses) included in net income and reclassification adjustment	(3)	(3)
TOTAL ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAXES	(6)	(9)
TOTAL COMMON SHAREHOLDERS' EQUITY (SEE STATEMENT OF COMMON SHAREHOLDER'S EQUITY)	$ 10,847	$ 10,552