Commitments, Guarantees and Contingencies (Tables)

9 Months Ended

Sep. 30, 2017

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	123.2	October 2017 to September 2018
OPCo	0.6		September 2018

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	42.1
APCo	8.8
I&M	3.4
OPCo	6.0
PSO	3.3
SWEPCo	3.7

Appalachian Power Co [Member]

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	42.1
APCo	8.8
I&M	3.4
OPCo	6.0
PSO	3.3
SWEPCo	3.7

Indiana Michigan Power Co [Member]

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	42.1
APCo	8.8
I&M	3.4
OPCo	6.0
PSO	3.3
SWEPCo	3.7

Ohio Power Co [Member]

Maximum Future Payments for Letters of Credit Uncommitted Facilities

Company	Amount		Maturity
	(in millions)
AEP	$	123.2	October 2017 to September 2018
OPCo	0.6		September 2018

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	42.1
APCo	8.8
I&M	3.4
OPCo	6.0
PSO	3.3
SWEPCo	3.7

Public Service Co Of Oklahoma [Member]

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	42.1
APCo	8.8
I&M	3.4
OPCo	6.0
PSO	3.3
SWEPCo	3.7

Southwestern Electric Power Co [Member]

Maximum Potential Loss on Master Lease Agreements

Company	Maximum Potential Loss
	(in millions)
AEP	$	42.1
APCo	8.8
I&M	3.4
OPCo	6.0
PSO	3.3
SWEPCo	3.7