Asset Impairment Expense (Tables)

6 Months Ended

Jun. 30, 2015

Impairment or Disposal of Tangible Assets Disclosure [Abstract]

Details of Impairment of Long-Lived Assets Held and Used by Asset

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in millions)
DP&L (East Bend)	$	—	$	—	$	—	$	12
Ebute	—		52		—		52
UK Wind	37		11		37		11
Other	—		—		8		$	—
Total asset impairment expense	$	37	$	63	$	45	$	75