Goodwill Impairment	3 Months Ended
Mar. 31, 2014
Goodwill Impairment [Abstract]
GOODWILL IMPAIRMENT	GOODWILL IMPAIRMENT DPLER — During the first quarter of 2014, the Company performed an interim impairment test on the $136 million goodwill at its DPLER reporting unit, a competitive retail marketer selling retail electricity to customers in Ohio and Illinois. The DPLER reporting unit was identified as being "at risk" during the fourth quarter of 2013. The impairment indicators arose based on market information available regarding actual and proposed sales of competitive retail marketers, which indicated a significant decline in valuations during the first quarter of 2014. In Step 1 of the interim impairment test, the fair value of the reporting unit was determined to be less than its carrying amount under both the market approach and the income approach using a discounted cash flow valuation model. The significant assumptions included commodity price curves, estimated electricity to be demanded by its customers, changes in its customer base through attrition and expansion, discount rates, the assumed tax structure and the level of working capital required to run the business. In the preliminary Step 2, the goodwill was determined to have an implied fair value of zero after the hypothetical purchase price allocation and the Company accordingly recognized a full impairment of the $136 million in goodwill at the DPLER reporting unit during the three months ended March 31, 2014. The full impairment represents the Company's best estimate of the impairment loss based on the latest information available and the results of the preliminary Step 2 test. The Step 2 test is incomplete, due to the significant amount of work required to calculate the implied fair value of goodwill for a competitive retail marketer and due to the timing of the identification of the interim impairment indicator. The significant items in the Step 2 test that are incomplete include, but are not limited to, the assumed tax structure, the valuation of customer relationship and customer contract intangible assets, trade name valuation and valuation of other executory contracts. In the second quarter of 2014, the Company expects to finalize the measurement of the goodwill impairment charge. DPLER is reported in the US SBU reportable segment. Buffalo Gap — During the first quarter of 2014, the Company recognized an $18 million impairment of its goodwill at its Buffalo Gap reporting unit, which is comprised of three wind projects in Texas with an aggregate generation capacity of 524 MW, and is reported in the US SBU reportable segment.

GOODWILL IMPAIRMENT

DPLER — During the first quarter of 2014, the Company performed an interim impairment test on the $136 million goodwill at its DPLER reporting unit, a competitive retail marketer selling retail electricity to customers in Ohio and Illinois. The DPLER reporting unit was identified as being "at risk" during the fourth quarter of 2013. The impairment indicators arose based on market information available regarding actual and proposed sales of competitive retail marketers, which indicated a significant decline in valuations during the first quarter of 2014.

In Step 1 of the interim impairment test, the fair value of the reporting unit was determined to be less than its carrying amount under both the market approach and the income approach using a discounted cash flow valuation model. The significant assumptions included commodity price curves, estimated electricity to be demanded by its customers, changes in its customer base through attrition and expansion, discount rates, the assumed tax structure and the level of working capital required to run the business.

In the preliminary Step 2, the goodwill was determined to have an implied fair value of zero after the hypothetical purchase price allocation and the Company accordingly recognized a full impairment of the $136 million in goodwill at the DPLER reporting unit during the three months ended March 31, 2014. The full impairment represents the Company's best estimate of the impairment loss based on the latest information available and the results of the preliminary Step 2 test. The Step 2 test is incomplete, due to the significant amount of work required to calculate the implied fair value of goodwill for a competitive retail marketer and due to the timing of the identification of the interim impairment indicator. The significant items in the Step 2 test that are incomplete include, but are not limited to, the assumed tax structure, the valuation of customer relationship and customer contract intangible assets, trade name valuation and valuation of other executory contracts. In the second quarter of 2014, the Company expects to finalize the measurement of the goodwill impairment charge. DPLER is reported in the US SBU reportable segment.

Buffalo Gap — During the first quarter of 2014, the Company recognized an $18 million impairment of its goodwill at its Buffalo Gap reporting unit, which is comprised of three wind projects in Texas with an aggregate generation capacity of 524 MW, and is reported in the US SBU reportable segment.