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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Changes in Carrying Amount of Goodwill
 
 
Corporate and Other
 
Generation
and
Marketing
 
AEP Consolidated
 
(in millions)
Balance as of December 31, 2013
 
$
75.9

 
$
15.4

 
$
91.3

Impairment Losses
 
—

 
—

 
—

Balance as of December 31, 2014
 
75.9

 
15.4

 
91.3

Impairment Losses
 
—

 
—

 
—

Goodwill Written Off Related to Sale of AEPRO
 
(38.8
)
(a)
—

 
(38.8
)
Balance as of December 31, 2015
 
$
37.1

 
$
15.4

 
$
52.5



(a) The goodwill of $38.8 million related to AEPRO is included in Other Classes of Assets That Are Not Major as of December 31, 2014 in Note 7. See “Dispositions” section of Note 7 for additional information.
Amortization Life, Gross Carrying Amount and Accumulated Amortization by Major Asset Class
 
 
 
December 31,
 
 
 
2015
 
2014
 
Amortization
Life
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
(in years)
 
(in millions)
Acquired Customer Contracts
5
 
$
58.3

 
$
56.5

 
$
58.3

 
$
53.4