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Commitments, Guarantees and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2015
Appalachian Power Co [Member]  
Maximum Future Payments of Letters of Credit
Company
 
Amount
 
Maturity
 
 
(in thousands)
 
 
I&M
 
$
35

 
March 2016
OPCo
 
4,200

 
June 2015
Pollution Control Bonds Supported by Bilateral Letters of Credit
Company
 
Pollution
Control Bonds
 
Bilateral Letters
of Credit
 
Maturity of Bilateral
Letters of Credit
 
 
(in thousands)
 
 
APCo
 
$
229,650

 
$
232,293

 
March 2016 to March 2017 
I&M
 
77,000

 
77,886

 
March 2017
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in thousands)
APCo
 
$
4,053

I&M
 
2,914

OPCo
 
4,886

PSO
 
2,263

SWEPCo
 
2,588
Indiana Michigan Power Co [Member]  
Maximum Future Payments of Letters of Credit
Company
 
Amount
 
Maturity
 
 
(in thousands)
 
 
I&M
 
$
35

 
March 2016
OPCo
 
4,200

 
June 2015
Pollution Control Bonds Supported by Bilateral Letters of Credit
Company
 
Pollution
Control Bonds
 
Bilateral Letters
of Credit
 
Maturity of Bilateral
Letters of Credit
 
 
(in thousands)
 
 
APCo
 
$
229,650

 
$
232,293

 
March 2016 to March 2017 
I&M
 
77,000

 
77,886

 
March 2017
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in thousands)
APCo
 
$
4,053

I&M
 
2,914

OPCo
 
4,886

PSO
 
2,263

SWEPCo
 
2,588
Ohio Power Co [Member]  
Maximum Future Payments of Letters of Credit
Company
 
Amount
 
Maturity
 
 
(in thousands)
 
 
I&M
 
$
35

 
March 2016
OPCo
 
4,200

 
June 2015
Pollution Control Bonds Supported by Bilateral Letters of Credit
Company
 
Pollution
Control Bonds
 
Bilateral Letters
of Credit
 
Maturity of Bilateral
Letters of Credit
 
 
(in thousands)
 
 
APCo
 
$
229,650

 
$
232,293

 
March 2016 to March 2017 
I&M
 
77,000

 
77,886

 
March 2017
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in thousands)
APCo
 
$
4,053

I&M
 
2,914

OPCo
 
4,886

PSO
 
2,263

SWEPCo
 
2,588
Public Service Co Of Oklahoma [Member]  
Maximum Future Payments of Letters of Credit
Company
 
Amount
 
Maturity
 
 
(in thousands)
 
 
I&M
 
$
35

 
March 2016
OPCo
 
4,200

 
June 2015
Pollution Control Bonds Supported by Bilateral Letters of Credit
Company
 
Pollution
Control Bonds
 
Bilateral Letters
of Credit
 
Maturity of Bilateral
Letters of Credit
 
 
(in thousands)
 
 
APCo
 
$
229,650

 
$
232,293

 
March 2016 to March 2017 
I&M
 
77,000

 
77,886

 
March 2017
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in thousands)
APCo
 
$
4,053

I&M
 
2,914

OPCo
 
4,886

PSO
 
2,263

SWEPCo
 
2,588
Southwestern Electric Power Co [Member]  
Maximum Future Payments of Letters of Credit
Company
 
Amount
 
Maturity
 
 
(in thousands)
 
 
I&M
 
$
35

 
March 2016
OPCo
 
4,200

 
June 2015
Pollution Control Bonds Supported by Bilateral Letters of Credit
Company
 
Pollution
Control Bonds
 
Bilateral Letters
of Credit
 
Maturity of Bilateral
Letters of Credit
 
 
(in thousands)
 
 
APCo
 
$
229,650

 
$
232,293

 
March 2016 to March 2017 
I&M
 
77,000

 
77,886

 
March 2017
Maximum Potential Loss on Master Lease Agreements
Company
 
Maximum
Potential Loss
 
 
(in thousands)
APCo
 
$
4,053

I&M
 
2,914

OPCo
 
4,886

PSO
 
2,263

SWEPCo
 
2,588