Goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Changes in Carrying Amount of Goodwill

		Corporate and Other		Generation & Marketing		AEP Consolidated
	(in millions)
Balance as of December 31, 2017		$	37.1	$	15.4	$	52.5
Impairment Losses		—		—		—
Balance as of December 31, 2018		37.1		15.4		52.5
Impairment Losses		—		—		—
Balance as of December 31, 2019		$	37.1	$	15.4	$	52.5