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Consolidated Statement Of Common Shareholders' Equity (USD $)
In Millions, except Share data
CECONY [Member]
Common Stock [Member]
CECONY [Member]
Additional Paid-In Capital [Member]
CECONY [Member]
Retained Earnings [Member]
CECONY [Member]
Repurchased Con Edison Stock [Member]
CECONY [Member]
Capital Stock Expense [Member]
CECONY [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
CECONY [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Capital Stock Expense [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Total
BEGINNING BALANCE at Dec. 31, 2009$ 589$ 3,877$ 5,909$ (962)$ (62)$ (4)$ 9,347$ 30$ 4,420$ 6,904$ (1,001)$ (62)$ (42)$ 10,249
BEGINNING BALANCE (in shares) at Dec. 31, 2009235,488,094      281,123,741  23,210,700   
Net income  246   246       
Capital contribution from parent 12    12       
Net income for common stock         226   226
Common stock dividends  (167)   (167)  (167)   (167)
Cumulative preferred dividends  (3)   (3)       
Issuance of common shares - dividend reinvestment and employee stock plans (in shares)       647,731      
Issuance of common shares - dividend reinvestment and employee stock plans        28    28
Other comprehensive income            33
ENDING BALANCE at Mar. 31, 20105893,8895,985(962)(62)(4)9,435304,4486,963(1,001)(62)(39)10,339
ENDING BALANCE (in shares) at Mar. 31, 2010235,488,094      281,771,472  23,210,700   
BEGINNING BALANCE at Dec. 31, 2009589  (962)(62)(4)9,347   (1,001)(62) 10,249
BEGINNING BALANCE (in shares) at Dec. 31, 2009235,488,094         23,210,700   
Net income      717      768
Net income for common stock      709      759
Cumulative preferred dividends      (8)      (9)
ENDING BALANCE at Sep. 30, 2010589  (962)(62)(4)9,591   (1,001)(62) 10,630
ENDING BALANCE (in shares) at Sep. 30, 2010235,488,094         23,210,700   
BEGINNING BALANCE at Mar. 31, 20105893,8895,985(962)(62)(4)9,435304,4486,963(1,001)(62)(39)10,339
BEGINNING BALANCE (in shares) at Mar. 31, 2010235,488,094      281,771,472  23,210,700   
Net income  138   138       
Capital contribution from parent 12    12       
Net income for common stock         183   183
Common stock dividends  (168)   (168)  (168)   (168)
Cumulative preferred dividends  (3)   (3)       
Issuance of common shares - dividend reinvestment and employee stock plans (in shares)       555,964      
Issuance of common shares - dividend reinvestment and employee stock plans        25    25
Other comprehensive income            11
ENDING BALANCE at Jun. 30, 20105893,9015,952(962)(62)(4)9,414304,4736,978(1,001)(62)(38)10,380
ENDING BALANCE (in shares) at Jun. 30, 2010235,488,094      282,327,436  23,210,700   
Net income  335   335      353
Capital contribution from parent 12    12       
Net income for common stock      332  350   350
Common stock dividends  (167)   (167)  (168)   (168)
Cumulative preferred dividends  (3)   (3)      (3)
Issuance of common shares - dividend reinvestment and employee stock plans (in shares)       1,487,598      
Issuance of common shares - dividend reinvestment and employee stock plans       166    67
Other comprehensive income            11
ENDING BALANCE at Sep. 30, 20105893,9136,117(962)(62)(4)9,591314,5397,160(1,001)(62)(37)10,630
ENDING BALANCE (in shares) at Sep. 30, 2010235,488,094      283,815,034  23,210,700   
BEGINNING BALANCE at Dec. 31, 20105894,2346,132(962)(64)(6)9,923314,9157,220(1,001)(64)(40)11,061
BEGINNING BALANCE (in shares) at Dec. 31, 2010235,488,094      291,616,334  23,210,700   
Net income  271   271       
Net income for common stock         311   311
Common stock dividends  (170)   (170)  (175)   (175)
Cumulative preferred dividends  (3)   (3)       
Issuance of common shares - dividend reinvestment and employee stock plans (in shares)       656,049      
Issuance of common shares - dividend reinvestment and employee stock plans       130    31
Other comprehensive income            33
ENDING BALANCE at Mar. 31, 20115894,2346,230(962)(64)(6)10,021324,9457,356 (64)(37)11,231
ENDING BALANCE (in shares) at Mar. 31, 2011235,488,094      292,272,383      
BEGINNING BALANCE at Dec. 31, 20105894,234 (962)(64)(6)9,923   (1,001)(64) 11,061
BEGINNING BALANCE (in shares) at Dec. 31, 2010235,488,094         23,210,700   
Net income      788      869
Net income for common stock      779      860
Cumulative preferred dividends      (9)      (9)
ENDING BALANCE at Sep. 30, 20115894,234 (962)(64)(6)10,192    (64) 11,454
ENDING BALANCE (in shares) at Sep. 30, 2011235,488,094             
BEGINNING BALANCE at Mar. 31, 20115894,2346,230(962)(64)(6)10,021324,9457,356(1,001)(64)(37)11,231
BEGINNING BALANCE (in shares) at Mar. 31, 2011235,488,094      292,272,383  23,210,700   
Net income  160   160       
Net income for common stock         165   165
Common stock dividends  (170)   (170)  (175)   (175)
Cumulative preferred dividends  (3)   (3)       
Issuance of common shares - dividend reinvestment and employee stock plans (in shares)       603,513  (182,942)   
Issuance of common shares - dividend reinvestment and employee stock plans        32 5  37
Common stock repurchases          (9)  (9)
Common stock repurchases, shares          178,942   
Other comprehensive income            22
ENDING BALANCE at Jun. 30, 20115894,2346,217(962)(64)(6)10,008324,9777,346(1,005)(64)(35)11,251
ENDING BALANCE (in shares) at Jun. 30, 2011235,488,094      292,875,896  23,206,700   
Net income  356   356      386
Net income for common stock      353  383   383
Common stock dividends  (169)   (169)  (176)   (176)
Cumulative preferred dividends  (3)   (3)      (3)
Issuance of common shares - dividend reinvestment and employee stock plans (in shares)       8,000  (554,356)   
Issuance of common shares - dividend reinvestment and employee stock plans        6 19  25
Common stock repurchases          (31)  (31)
Common stock repurchases, shares          546,356   
Other comprehensive income            22
ENDING BALANCE at Sep. 30, 2011$ 589$ 4,234$ 6,401$ (962)$ (64)$ (6)$ 10,192$ 32$ 4,983$ 7,553$ (1,017)$ (64)$ (33)$ 11,454
ENDING BALANCE (in shares) at Sep. 30, 2011235,488,094      292,883,896  23,198,700