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Consolidated Statement Of Capitalization - Long-Term Debt (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
TOTAL DEBENTURES $ 9,210 $ 9,210
TOTAL TRANSITION BONDS 29 32
TOTAL TAX-EXEMPT DEBT 1,130 1,130
Other long-term debt 321 323
Unamortized debt discount (17) (19)
TOTAL 10,673 10,676
Less: long-term debt due within one year 530 5
TOTAL LONG-TERM DEBT 10,143 10,671
TOTAL CAPITALIZATION 21,792 21,945
CECONY [Member]
    
TOTAL DEBENTURES 8,675 8,675
TOTAL TAX-EXEMPT DEBT 1,086 1,086
Unamortized debt discount (16) (18)
TOTAL 9,745 9,743
Less: long-term debt due within one year 525  
TOTAL LONG-TERM DEBT 9,220 9,743
TOTAL CAPITALIZATION 19,651 19,879
Debenture Series 2002A, 5.625% Due 2012 [Member]
    
Debt Instrument, Fair Value 300 300
Interest Rate 5.625%  
Maturity Date 2012  
Debenture Series 2002A, 5.625% Due 2012 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 300 300
Interest Rate 5.625%  
Maturity Date 2012  
Debenture Series 2002B, 4.875% Due 2013 [Member]
    
Debt Instrument, Fair Value 500 500
Interest Rate 4.875%  
Maturity Date 2013  
Debenture Series 2002B, 4.875% Due 2013 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 500 500
Interest Rate 4.875%  
Maturity Date 2013  
Debenture Series 2003B, 3.85% Due 2013 [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 3.85%  
Maturity Date 2013  
Debenture Series 2003B, 3.85% Due 2013 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 3.85%  
Maturity Date 2013  
Debenture Series 2004A, 4.70% Due 2014 [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 4.70%  
Maturity Date 2014  
Debenture Series 2004A, 4.70% Due 2014 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 4.70%  
Maturity Date 2014  
Debenture Series 2009A, 5.55% Due 2014 [Member]
    
Debt Instrument, Fair Value 275 275
Interest Rate 5.55%  
Maturity Date 2014  
Debenture Series 2009A, 5.55% Due 2014 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 275 275
Interest Rate 5.55%  
Maturity Date 2014  
Debenture Series 2005A, 5.30% Due 2015 [Member]
    
Debt Instrument, Fair Value 40 40
Interest Rate 5.30%  
Maturity Date 2015  
Debenture Series 2005C, 5.375% Due 2015 [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 5.375%  
Maturity Date 2015  
Debenture Series 2005C, 5.375% Due 2015 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 5.375%  
Maturity Date 2015  
Debenture Series 2010A, 2.50% Due 2015 [Member]
    
Debt Instrument, Fair Value 55 55
Interest Rate 2.50%  
Maturity Date 2015  
Debenture Series 2006A, 5.45% Due 2016 [Member]
    
Debt Instrument, Fair Value 75 75
Interest Rate 5.45%  
Maturity Date 2016  
Debenture Series 2006C, 5.50% Due 2016 [Member]
    
Debt Instrument, Fair Value 400 400
Interest Rate 5.50%  
Maturity Date 2016  
Debenture Series 2006C, 5.50% Due 2016 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 400 400
Interest Rate 5.50%  
Maturity Date 2016  
Debenture Series 2006D, 5.30% Due 2016 [Member]
    
Debt Instrument, Fair Value 250 250
Interest Rate 5.30%  
Maturity Date 2016  
Debenture Series 2006D, 5.30% Due 2016 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 250 250
Interest Rate 5.30%  
Maturity Date 2016  
Debenture Series 2008A, 5.85% Due 2018 [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 5.85%  
Maturity Date 2018  
Debenture Series 2008A, 5.85% Due 2018 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 5.85%  
Maturity Date 2018  
Debenture Series 2008A, 6.15% Due 2018 [Member]
    
Debt Instrument, Fair Value 50 50
Interest Rate 6.15%  
Maturity Date 2018  
Debenture Series 2008C, 7.125% Due 2018 [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 7.125%  
Maturity Date 2018  
Debenture Series 2008C, 7.125% Due 2018 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 7.125%  
Maturity Date 2018  
Debenture Series 2009A, 4.96% Due 2019 [Member]
    
Debt Instrument, Fair Value 60 60
Interest Rate 4.96%  
Maturity Date 2019  
Debenture Series 2009B, 6.65% Due 2019 [Member]
    
Debt Instrument, Fair Value 475 475
Interest Rate 6.65%  
Maturity Date 2019  
Debenture Series 2009B, 6.65% Due 2019 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 475 475
Interest Rate 6.65%  
Maturity Date 2019  
Debenture Series 2010A, 4.45% Due 2020 [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 4.45%  
Maturity Date 2020  
Debenture Series 2010A, 4.45% Due 2020 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 4.45%  
Maturity Date 2020  
Debenture Series 1997F, 6.50% Due 2027 [Member]
    
Debt Instrument, Fair Value 80 80
Interest Rate 6.50%  
Maturity Date 2027  
Debenture Series 2003A, 5.875% Due 2033 [Member]
    
Debt Instrument, Fair Value 175 175
Interest Rate 5.875%  
Maturity Date 2033  
Debenture Series 2003A, 5.875% Due 2033 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 175 175
Interest Rate 5.875%  
Maturity Date 2033  
Debenture Series 2003C, 5.10% Due 2033 [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 5.10%  
Maturity Date 2033  
Debenture Series 2003C, 5.10% Due 2033 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 5.10%  
Maturity Date 2033  
Debenture Series 2004B, 5.70% Due 2034 [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 5.70%  
Maturity Date 2034  
Debenture Series 2004B, 5.70% Due 2034 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 200 200
Interest Rate 5.70%  
Maturity Date 2034  
Debenture Series 2005A, 5.30% Due 2035 [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 5.30%  
Maturity Date 2035  
Debenture Series 2005A, 5.30% Due 2035 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 5.30%  
Maturity Date 2035  
Debenture Series 2005B, 5.25% Due 2035 [Member]
    
Debt Instrument, Fair Value 125 125
Interest Rate 5.25%  
Maturity Date 2035  
Debenture Series 2005B, 5.25% Due 2035 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 125 125
Interest Rate 5.25%  
Maturity Date 2035  
Debenture Series 2006A, 5.85% Due 2036 [Member]
    
Debt Instrument, Fair Value 400 400
Interest Rate 5.85%  
Maturity Date 2036  
Debenture Series 2006A, 5.85% Due 2036 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 400 400
Interest Rate 5.85%  
Maturity Date 2036  
Debenture Series 2006B, 6.20% Due 2036 [Member]
    
Debt Instrument, Fair Value 400 400
Interest Rate 6.20%  
Maturity Date 2036  
Debenture Series 2006B, 6.20% Due 2036 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 400 400
Interest Rate 6.20%  
Maturity Date 2036  
Debenture Series 2006E, 5.70% Due 2036 [Member]
    
Debt Instrument, Fair Value 250 250
Interest Rate 5.70%  
Maturity Date 2036  
Debenture Series 2006E, 5.70% Due 2036 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 250 250
Interest Rate 5.70%  
Maturity Date 2036  
Debenture Series 2007A, 6.30% Due 2037 [Member]
    
Debt Instrument, Fair Value 525 525
Interest Rate 6.30%  
Maturity Date 2037  
Debenture Series 2007A, 6.30% Due 2037 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 525 525
Interest Rate 6.30%  
Maturity Date 2037  
Debenture Series 2008B, 6.75% Due 2038 [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 6.75%  
Maturity Date 2038  
Debenture Series 2008B, 6.75% Due 2038 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 6.75%  
Maturity Date 2038  
Debenture Series 2009B, 6.00% Due 2039 [Member]
    
Debt Instrument, Fair Value 60 60
Interest Rate 6.00%  
Maturity Date 2039  
Debenture Series 2009C, 5.50% Due 2039 [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 5.50%  
Maturity Date 2039  
Debenture Series 2009C, 5.50% Due 2039 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 600 600
Interest Rate 5.50%  
Maturity Date 2039  
Debenture Series 2010B, 5.70% Due 2040 [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 5.70%  
Maturity Date 2040  
Debenture Series 2010B, 5.70% Due 2040 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 350 350
Interest Rate 5.70%  
Maturity Date 2040  
Debenture Series 2010B, 5.50% Due 2040 [Member]
    
Debt Instrument, Fair Value 115 115
Interest Rate 5.50%  
Maturity Date 2040  
Transition Bonds Series 2004-1, 5.22% Due 2019 [Member]
    
Interest Rate 5.22% [1]  
Maturity Date 2019 [1]  
Transition Bonds 29 [1] 32 [1]
Tax Exempt Debt Series 1995 0.20 % Due 2015 [Member]
    
Debt Instrument, Fair Value 44 [2],[3] 44 [2],[3]
Interest Rate 0.20% [2],[3]  
Maturity Date 2015 [2],[3]  
Tax Exempt Debt Series 2004B-1, 0.193% Due 2032 [Member]
    
Debt Instrument, Fair Value 127 [2] 127 [2]
Interest Rate 0.193% [2]  
Maturity Date 2032 [2]  
Tax Exempt Debt Series 2004B-1, 0.193% Due 2032 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 127 [2] 127 [2]
Interest Rate 0.193% [2]  
Maturity Date 2032 [2]  
Tax Exempt Debt Series 1999A, 0.139% Due 2034 [Member]
    
Debt Instrument, Fair Value 293 [2] 293 [2]
Interest Rate 0.139% [2]  
Maturity Date 2034 [2]  
Tax Exempt Debt Series 1999A, 0.139% Due 2034 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 293 [2] 293 [2]
Interest Rate 0.139% [2]  
Maturity Date 2034 [2]  
Tax Exempt Debt Series 2004B-2, 0.193% Due 2035 [Member]
    
Debt Instrument, Fair Value 20 [2] 20 [2]
Interest Rate 0.193% [2]  
Maturity Date 2035 [2]  
Tax Exempt Debt Series 2004B-2, 0.193% Due 2035 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 20 [2] 20 [2]
Interest Rate 0.193% [2]  
Maturity Date 2035 [2]  
Tax Exempt Debt Series 2001B, 0.222 Due 2036 [Member]
    
Debt Instrument, Fair Value 98 [2] 98 [2]
Interest Rate 0.222% [2]  
Maturity Date 2036 [2]  
Tax Exempt Debt Series 2001B, 0.222 Due 2036 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 98 [2] 98 [2]
Interest Rate 0.222% [2]  
Maturity Date 2036 [2]  
Tax Exempt Debt Series 2010A, 1.45% Due 2036 [Member]
    
Debt Instrument, Fair Value 225 [2],[4] 225 [2],[4]
Interest Rate 1.45% [2],[4]  
Maturity Date 2036 [2],[4]  
Tax Exempt Debt Series 2010A, 1.45% Due 2036 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 225 [2] 225 [2]
Interest Rate 1.45% [2]  
Maturity Date 2036 [2]  
Tax Exempt Debt Series 2004A, 0.21 % Due 2039 [Member]
    
Debt Instrument, Fair Value 98 [2] 98 [2]
Interest Rate 0.21% [2]  
Maturity Date 2039 [2]  
Tax Exempt Debt Series 2004A, 0.21 % Due 2039 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 98 [2] 98 [2]
Interest Rate 0.21% [2]  
Maturity Date 2039 [2]  
Tax Exempt Debt Series 2004C, 0.08% Due 2039 [Member]
    
Debt Instrument, Fair Value 99 [2] 99 [2]
Interest Rate 0.08% [2]  
Maturity Date 2039 [2]  
Tax Exempt Debt Series 2004C, 0.08% Due 2039 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value 99 [2] 99 [2]
Interest Rate 0.08% [2]  
Maturity Date 2039 [2]  
Tax Exempt Debt Series 2005A, 0.067% Due 2039 [Member]
    
Debt Instrument, Fair Value 126 [2] 126 [2]
Interest Rate 0.067% [2]  
Maturity Date 2039 [2]  
Tax Exempt Debt Series 2005A, 0.067% Due 2039 [Member] | CECONY [Member]
    
Debt Instrument, Fair Value $ 126 [2] $ 126 [2]
Interest Rate 0.067% [2]  
Maturity Date 2039 [2]  
[1] The final date to pay the entire remaining unpaid principal balance, if any, of all outstanding bonds is May 17, 2021.
[2] Other than Series 2010A, rates reset weekly or by auction held every 35 days; December 30, 2011 rates shown.
[3] Issued for O&R pollution control financing.
[4] Subject to mandatory tender in 2012.