Income Tax	3 Months Ended
Income Tax	Mar. 31, 2013
Income Tax	Note I — Income Tax In the first quarter of 2013, the IRS accepted on audit Con Edison’s claim for manufacturing tax deductions. Accordingly, this quarter, Con Edison’s effective tax rate was favorably impacted by $15 million. In addition, as a result of interest expense on the LILO disallowances and reduction to non-utility operating revenues (see “Lease In/Lease Out Transactions” in Note H), income before income tax expense for the first quarter of 2013 is significantly lower than the first quarter of 2012. Other recurring tax rate reconciling items in the first quarter of 2013 and 2012 are comparable; however, as a result of lower income before income tax expense in 2013, Con Edison’s effective tax rate was significantly lower than 2012. Uncertain Tax Positions During the first quarter of 2013, the IRS accepted Con Edison’s deductions for repair costs to utility plant (the “repair allowance deductions”). As a result of this settlement, Con Edison and CECONY reduced their estimated liabilities for prior year uncertain tax positions by $72 million and $66 million, respectively, with a corresponding increase to accumulated deferred income tax liabilities. In addition, as a result of the January 2013 Court of Appeals decision (see “Lease In/Lease Out Transactions” in Note H), Con Edison increased its estimated prior year liabilities for federal and state uncertain tax positions by $238 million in the first quarter of 2013, with a corresponding reduction to accumulated deferred income tax liabilities. These changes to the Companies’ estimated liabilities for uncertain tax positions had no impact on income tax expense in the first quarter of 2013. There were no material changes to the Companies’ estimated liabilities for uncertain tax positions during the first quarter of 2012. At March 31, 2013, the estimated liabilities for uncertain tax positions for Con Edison and CECONY were $251 million and $7 million, respectively. 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 first quarter of 2013, Con Edison recognized $126 million of interest expense ($131 million related to the LILO transactions, less a reduction of $5 million in accrued interest expense primarily associated with repair allowance deductions). Con Edison’s accrued interest on uncertain tax positions at March 31, 2013 was $137 million, compared with $11 million at December 31, 2012. Accrued interest on CECONY’s consolidated balance sheet was immaterial. The Companies reasonably expect to resolve their uncertain tax positions with the IRS within the next twelve months, and accordingly have reflected their estimated liability for uncertain tax positions as current liabilities on their respective consolidated balance sheets. At March 31, 2013, the total amount of unrecognized tax benefits that, if recognized, would affect the Companies’ effective tax rate is $6 million for Con Edison and no impact to CECONY.
CECONY [Member]
Income Tax	Note I — Income Tax In the first quarter of 2013, the IRS accepted on audit Con Edison’s claim for manufacturing tax deductions. Accordingly, this quarter, Con Edison’s effective tax rate was favorably impacted by $15 million. In addition, as a result of interest expense on the LILO disallowances and reduction to non-utility operating revenues (see “Lease In/Lease Out Transactions” in Note H), income before income tax expense for the first quarter of 2013 is significantly lower than the first quarter of 2012. Other recurring tax rate reconciling items in the first quarter of 2013 and 2012 are comparable; however, as a result of lower income before income tax expense in 2013, Con Edison’s effective tax rate was significantly lower than 2012. Uncertain Tax Positions During the first quarter of 2013, the IRS accepted Con Edison’s deductions for repair costs to utility plant (the “repair allowance deductions”). As a result of this settlement, Con Edison and CECONY reduced their estimated liabilities for prior year uncertain tax positions by $72 million and $66 million, respectively, with a corresponding increase to accumulated deferred income tax liabilities. In addition, as a result of the January 2013 Court of Appeals decision (see “Lease In/Lease Out Transactions” in Note H), Con Edison increased its estimated prior year liabilities for federal and state uncertain tax positions by $238 million in the first quarter of 2013, with a corresponding reduction to accumulated deferred income tax liabilities. These changes to the Companies’ estimated liabilities for uncertain tax positions had no impact on income tax expense in the first quarter of 2013. There were no material changes to the Companies’ estimated liabilities for uncertain tax positions during the first quarter of 2012. At March 31, 2013, the estimated liabilities for uncertain tax positions for Con Edison and CECONY were $251 million and $7 million, respectively. 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 first quarter of 2013, Con Edison recognized $126 million of interest expense ($131 million related to the LILO transactions, less a reduction of $5 million in accrued interest expense primarily associated with repair allowance deductions). Con Edison’s accrued interest on uncertain tax positions at March 31, 2013 was $137 million, compared with $11 million at December 31, 2012. Accrued interest on CECONY’s consolidated balance sheet was immaterial. The Companies reasonably expect to resolve their uncertain tax positions with the IRS within the next twelve months, and accordingly have reflected their estimated liability for uncertain tax positions as current liabilities on their respective consolidated balance sheets. At March 31, 2013, the total amount of unrecognized tax benefits that, if recognized, would affect the Companies’ effective tax rate is $6 million for Con Edison and no impact to CECONY.

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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+ Details

CONSOLIDATED EDISON CO OF NEW YORK INC 10-Q