Asset Impairment Expense (Tables)

6 Months Ended

Jun. 30, 2014

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,
	2014		2013		2014		2013
	(in millions)
Beaver Valley	$	—	$	—	$	—	$	46
DP&L (East Bend)	—		—		12		—
Ebute	52		—		52		—
UK Wind (Newfield)	11		—		11		—
Other	—		—		—		2
Total asset impairment expense	$	63	$	—	$	75	$	48