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Commitments, Guarantees and Contingencies (Tables)
3 Months Ended
Mar. 31, 2017
Maximum Future Payments for Letters of Credit Uncommitted Facilities
Company
 
Amount
 
Maturity
 
 
(in millions)
 
 
AEP
 
$
174.4

 
April 2017 to March 2018
OPCo
 
0.6

 
September 2017
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in millions)
AEP
 
$
37.8

APCo
 
5.7

I&M
 
3.2

OPCo
 
5.9

PSO
 
3.1

SWEPCo
 
3.6

Appalachian Power Co [Member]  
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in millions)
AEP
 
$
37.8

APCo
 
5.7

I&M
 
3.2

OPCo
 
5.9

PSO
 
3.1

SWEPCo
 
3.6

Indiana Michigan Power Co [Member]  
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in millions)
AEP
 
$
37.8

APCo
 
5.7

I&M
 
3.2

OPCo
 
5.9

PSO
 
3.1

SWEPCo
 
3.6

Ohio Power Co [Member]  
Maximum Future Payments for Letters of Credit Uncommitted Facilities
Company
 
Amount
 
Maturity
 
 
(in millions)
 
 
AEP
 
$
174.4

 
April 2017 to March 2018
OPCo
 
0.6

 
September 2017
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in millions)
AEP
 
$
37.8

APCo
 
5.7

I&M
 
3.2

OPCo
 
5.9

PSO
 
3.1

SWEPCo
 
3.6

Public Service Co Of Oklahoma [Member]  
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in millions)
AEP
 
$
37.8

APCo
 
5.7

I&M
 
3.2

OPCo
 
5.9

PSO
 
3.1

SWEPCo
 
3.6

Southwestern Electric Power Co [Member]  
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in millions)
AEP
 
$
37.8

APCo
 
5.7

I&M
 
3.2

OPCo
 
5.9

PSO
 
3.1

SWEPCo
 
3.6