Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Capitalized Cost Of Utility Plant

	Con Edison				CECONY
(millions of dollars)	2011		2010		2011		2010
Electric
Generation	$	400	$	396	$	400	$	396
Transmission		2,654		2,284		2,476		2,150
Distribution		13,805		13,191		13,125		12,549
Gas*		3,858		3,535		3,455		3,153
Steam		1,651		1,617		1,651		1,617
General		1,282		1,241		1,162		1,125
Held for future use		74		72		62		60
Construction work in progress		1,241		1,458		1,165		1,344
Net Utility Plant	$	24,965	$	23,794	$	23,496	$	22,394

* Primarily distribution.

Research And Development Costs

	For the Years Ended December 31,
(millions of dollars)	2011		2010		2009
Con Edison	$	23	$	23	$	27
CECONY	$	21	$	21	$	25

Earnings Per Common Share

	For the Years Ended December 31,
(millions of dollars, except per share amounts/shares in millions)	2011		2010		2009
Net income for common stock	$	1,051	$	992	$	868
Weighted average common shares outstanding – Basic		292.6		284.3		275.2
Add: Incremental shares attributable to effect of potentially dilutive securities		1.8		1.6		1.1
Adjusted weighted average common shares outstanding – Diluted		294.4		285.9		276.3
Net Income for common stock per common share – basic	$	3.59	$	3.49	$	3.16
Net Income for common stock per common share – diluted	$	3.57	$	3.47	$	3.14