Commitments, Guarantees and Contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Appalachian Power Co [Member]

Pollution Control Bonds Supported by Bilateral Letters of Credit

			Bilateral		Maturity of
	Pollution		Letters		Bilateral Letters
Company	Control Bonds		of Credit		of Credit
	(in thousands)
APCo	$	229,650	$	232,293	March 2014 to March 2015
I&M		77,000		77,886	March 2015
OPCo		50,000		50,575	July 2014

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,639
I&M		2,495
OPCo		4,543
PSO		1,202
SWEPCo		2,442

Indiana Michigan Power Co [Member]

Maximum Future Payments of Letters of Credit

Company	Amount		Maturity
	(in thousands)
I&M	$	150	March 2014
OPCo		3,081	June 2014
SWEPCo		4,448	March 2014

Pollution Control Bonds Supported by Bilateral Letters of Credit

			Bilateral		Maturity of
	Pollution		Letters		Bilateral Letters
Company	Control Bonds		of Credit		of Credit
	(in thousands)
APCo	$	229,650	$	232,293	March 2014 to March 2015
I&M		77,000		77,886	March 2015
OPCo		50,000		50,575	July 2014

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,639
I&M		2,495
OPCo		4,543
PSO		1,202
SWEPCo		2,442

Ohio Power Co [Member]

Maximum Future Payments of Letters of Credit

Company	Amount		Maturity
	(in thousands)
I&M	$	150	March 2014
OPCo		3,081	June 2014
SWEPCo		4,448	March 2014

Pollution Control Bonds Supported by Bilateral Letters of Credit

			Bilateral		Maturity of
	Pollution		Letters		Bilateral Letters
Company	Control Bonds		of Credit		of Credit
	(in thousands)
APCo	$	229,650	$	232,293	March 2014 to March 2015
I&M		77,000		77,886	March 2015
OPCo		50,000		50,575	July 2014

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,639
I&M		2,495
OPCo		4,543
PSO		1,202
SWEPCo		2,442

Public Service Co Of Oklahoma [Member]

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,639
I&M		2,495
OPCo		4,543
PSO		1,202
SWEPCo		2,442

Southwestern Electric Power Co [Member]

Maximum Future Payments of Letters of Credit

Company	Amount		Maturity
	(in thousands)
I&M	$	150	March 2014
OPCo		3,081	June 2014
SWEPCo		4,448	March 2014

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,639
I&M		2,495
OPCo		4,543
PSO		1,202
SWEPCo		2,442