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Consolidated Statement Of Comprehensive Income (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
NET INCOME$ 386$ 353$ 869$ 768
OTHER COMPREHENSIVE INCOME, NET OF TAXES    
Pension plan liability adjustments2175
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES2175
COMPREHENSIVE INCOME388354876773
Preferred stock dividend requirements of subsidiary(3)(3)(9)(9)
COMPREHENSIVE INCOME FOR COMMON STOCK385351867764
CECONY [Member]
    
NET INCOME356335788717
OTHER COMPREHENSIVE INCOME, NET OF TAXES    
Preferred stock dividend requirements of subsidiary$ (3)$ (3)$ (9)$ (8)