Commitments, Guarantees and Contingencies (Tables)

3 Months Ended

Mar. 31, 2016

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	190.2	June 2016 to March 2017
OPCo	4.2		September 2016

Pollution Control Bonds Supported by Bilateral Letters of Credit

Company	Pollution Control Bonds		Bilateral Letters of Credit		Maturity of Bilateral Letters of Credit
	(in millions)
AEP	$	351.4	$	355.4	June 2016 to July 2017
APCo	104.4		105.6		March 2017
I&M	77.0		77.9		March 2017

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	33.6
APCo	4.9
I&M	3.0
OPCo	5.3
PSO	2.8
SWEPCo	3.1

Appalachian Power Co [Member]

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	190.2	June 2016 to March 2017
OPCo	4.2		September 2016

Pollution Control Bonds Supported by Bilateral Letters of Credit

Company	Pollution Control Bonds		Bilateral Letters of Credit		Maturity of Bilateral Letters of Credit
	(in millions)
AEP	$	351.4	$	355.4	June 2016 to July 2017
APCo	104.4		105.6		March 2017
I&M	77.0		77.9		March 2017

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	33.6
APCo	4.9
I&M	3.0
OPCo	5.3
PSO	2.8
SWEPCo	3.1

Indiana Michigan Power Co [Member]

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	190.2	June 2016 to March 2017
OPCo	4.2		September 2016

Pollution Control Bonds Supported by Bilateral Letters of Credit

Company	Pollution Control Bonds		Bilateral Letters of Credit		Maturity of Bilateral Letters of Credit
	(in millions)
AEP	$	351.4	$	355.4	June 2016 to July 2017
APCo	104.4		105.6		March 2017
I&M	77.0		77.9		March 2017

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	33.6
APCo	4.9
I&M	3.0
OPCo	5.3
PSO	2.8
SWEPCo	3.1

Ohio Power Co [Member]

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	190.2	June 2016 to March 2017
OPCo	4.2		September 2016

Pollution Control Bonds Supported by Bilateral Letters of Credit

Company	Pollution Control Bonds		Bilateral Letters of Credit		Maturity of Bilateral Letters of Credit
	(in millions)
AEP	$	351.4	$	355.4	June 2016 to July 2017
APCo	104.4		105.6		March 2017
I&M	77.0		77.9		March 2017

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	33.6
APCo	4.9
I&M	3.0
OPCo	5.3
PSO	2.8
SWEPCo	3.1

Public Service Co Of Oklahoma [Member]

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	190.2	June 2016 to March 2017
OPCo	4.2		September 2016

Pollution Control Bonds Supported by Bilateral Letters of Credit

Company	Pollution Control Bonds		Bilateral Letters of Credit		Maturity of Bilateral Letters of Credit
	(in millions)
AEP	$	351.4	$	355.4	June 2016 to July 2017
APCo	104.4		105.6		March 2017
I&M	77.0		77.9		March 2017

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	33.6
APCo	4.9
I&M	3.0
OPCo	5.3
PSO	2.8
SWEPCo	3.1

Southwestern Electric Power Co [Member]

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	190.2	June 2016 to March 2017
OPCo	4.2		September 2016

Pollution Control Bonds Supported by Bilateral Letters of Credit

Company	Pollution Control Bonds		Bilateral Letters of Credit		Maturity of Bilateral Letters of Credit
	(in millions)
AEP	$	351.4	$	355.4	June 2016 to July 2017
APCo	104.4		105.6		March 2017
I&M	77.0		77.9		March 2017

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	33.6
APCo	4.9
I&M	3.0
OPCo	5.3
PSO	2.8
SWEPCo	3.1