Goodwill	12 Months Ended
Goodwill	Dec. 31, 2014
Goodwill	Note K – Goodwill In 2014 and 2013, Con Edison completed impairment tests for its goodwill of $406 million related to the O&R merger, and determined that it was not impaired. For the impairment test, $245 million and $161 million of the goodwill were allocated to CECONY and O&R, respectively. In 2014 and 2013, Con Edison also completed impairment tests for the goodwill of $23 million related to two energy services companies acquired by Con Edison Solutions and a gas storage company acquired by Con Edison Development, and determined that the goodwill was not impaired. Estimates of future cash flows, projected growth rates, and discount rates inherent in the cash flow estimates for the energy services companies and gas storage company may vary significantly from actual results, which could result in a future impairment of goodwill. Prior to 2014, Con Edison performed its annual goodwill impairment test on either January 1 or December 31. During the fourth quarter of 2014, Con Edison changed its annual goodwill impairment testing date from January 1 and December 31 to October 1. This change is preferable under the circumstances as it aligns the timing of the annual goodwill impairment test with the strategic planning and budgeting process, which will allow Con Edison to utilize the updated strategic business plans that result from the budget process in the discounted cash flow analyses that it uses to estimate the fair value of its reporting units. This change does not accelerate, delay, avoid or cause an impairment charge, nor does this change result in adjustments to previously issued financial statements. The annual goodwill impairment testing was performed as of October 1, 2014. Consideration was also given to the period between the testing date and December 31, 2014, in order to conclude that no facts or circumstances have arisen that would lead to a different conclusion as of December 31, 2014.
CECONY [Member]
Goodwill	Note K – Goodwill In 2014 and 2013, Con Edison completed impairment tests for its goodwill of $406 million related to the O&R merger, and determined that it was not impaired. For the impairment test, $245 million and $161 million of the goodwill were allocated to CECONY and O&R, respectively. In 2014 and 2013, Con Edison also completed impairment tests for the goodwill of $23 million related to two energy services companies acquired by Con Edison Solutions and a gas storage company acquired by Con Edison Development, and determined that the goodwill was not impaired. Estimates of future cash flows, projected growth rates, and discount rates inherent in the cash flow estimates for the energy services companies and gas storage company may vary significantly from actual results, which could result in a future impairment of goodwill. Prior to 2014, Con Edison performed its annual goodwill impairment test on either January 1 or December 31. During the fourth quarter of 2014, Con Edison changed its annual goodwill impairment testing date from January 1 and December 31 to October 1. This change is preferable under the circumstances as it aligns the timing of the annual goodwill impairment test with the strategic planning and budgeting process, which will allow Con Edison to utilize the updated strategic business plans that result from the budget process in the discounted cash flow analyses that it uses to estimate the fair value of its reporting units. This change does not accelerate, delay, avoid or cause an impairment charge, nor does this change result in adjustments to previously issued financial statements. The annual goodwill impairment testing was performed as of October 1, 2014. Consideration was also given to the period between the testing date and December 31, 2014, in order to conclude that no facts or circumstances have arisen that would lead to a different conclusion as of December 31, 2014.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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