Income Tax	3 Months Ended
Income Tax	Mar. 31, 2015
Income Tax	Note I — Income Tax Con Edison’s income tax expense increased to $199 million for the three months ended March 31, 2015 from $198 million for the three months ended March 31, 2014. The effective tax rate for the three months ended March 31, 2015 and 2014 was 35 percent. CECONY’s income tax expense increased to $192 million for the three months ended March 31, 2015 from $184 million for the three months ended March 31, 2014. The effective tax rate for the three months ended March 31, 2015 and 2014 was 36 percent. Uncertain Tax Positions At March 31, 2015, the estimated liability for uncertain tax positions for Con Edison was $34 million ($2 million for CECONY). Con Edison reasonably expects to resolve approximately $25 million ($16 million, net of federal taxes) of its uncertain tax positions within the next twelve months, of which the entire amount, if recognized, would reduce Con Edison’s effective tax rate. The amount related to CECONY is approximately $2 million ($1 million, net of federal taxes), of which the entire amount, if recognized, would reduce CECONY’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $34 million ($22 million, net of federal taxes). The Companies recognize interest on liabilities for uncertain tax positions in interest expense and would recognize penalties, if any, in operating expenses in the Companies’ consolidated income statements. In the three months ended March 31, 2015, Con Edison recognized an immaterial amount of interest expense and no penalties for uncertain tax positions in its consolidated income statements. At March 31, 2015 and December 31, 2014, Con Edison recognized an immaterial amount of accrued interest on its consolidated balance sheets.
CECONY [Member]
Income Tax	Note I — Income Tax Con Edison’s income tax expense increased to $199 million for the three months ended March 31, 2015 from $198 million for the three months ended March 31, 2014. The effective tax rate for the three months ended March 31, 2015 and 2014 was 35 percent. CECONY’s income tax expense increased to $192 million for the three months ended March 31, 2015 from $184 million for the three months ended March 31, 2014. The effective tax rate for the three months ended March 31, 2015 and 2014 was 36 percent. Uncertain Tax Positions At March 31, 2015, the estimated liability for uncertain tax positions for Con Edison was $34 million ($2 million for CECONY). Con Edison reasonably expects to resolve approximately $25 million ($16 million, net of federal taxes) of its uncertain tax positions within the next twelve months, of which the entire amount, if recognized, would reduce Con Edison’s effective tax rate. The amount related to CECONY is approximately $2 million ($1 million, net of federal taxes), of which the entire amount, if recognized, would reduce CECONY’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $34 million ($22 million, net of federal taxes). The Companies recognize interest on liabilities for uncertain tax positions in interest expense and would recognize penalties, if any, in operating expenses in the Companies’ consolidated income statements. In the three months ended March 31, 2015, Con Edison recognized an immaterial amount of interest expense and no penalties for uncertain tax positions in its consolidated income statements. At March 31, 2015 and December 31, 2014, Con Edison recognized an immaterial amount of accrued interest on its consolidated balance sheets.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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