Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

	Vertically Integrated Utilities		AEP River Operations		Generation and Marketing		AEP Consolidated
	(in millions)
Balance as of December 31, 2012	$	37	$	39	$	15	$	91
Impairment Losses	—		—		—		—
Balance as of December 31, 2013	37		39		15		91
Impairment Losses	—		—		—		—
Balance as of December 31, 2014	$	37	$	39	$	15	$	91

Amortization Life, Gross Carrying Amount and Accumulated Amortization by Major Asset Class

		December 31,
		2014				2013
	Amortization Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
	(in years)	(in millions)
Acquired Customer Contracts	5	$	58	$	53	$	58	$	48