Commitments, Guarantees and Contingencies (Tables)

9 Months Ended

Sep. 30, 2012

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 2013 to March 2014
I&M		77,000		77,886	March 2013
OPCo		50,000		50,575	March 2013

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,132
I&M		2,426
OPCo		3,556
PSO		1,167
SWEPCo		2,559

Indiana Michigan Power Co [Member]

Maximum Future Payments of Letters of Credit

Company	Amount		Maturity
	(in thousands)
I&M	$	150	March 2013
OPCo		2,102	June 2013
SWEPCo		4,448	March 2013

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 2013 to March 2014
I&M		77,000		77,886	March 2013
OPCo		50,000		50,575	March 2013

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,132
I&M		2,426
OPCo		3,556
PSO		1,167
SWEPCo		2,559

Ohio Power Co [Member]

Maximum Future Payments of Letters of Credit

Company	Amount		Maturity
	(in thousands)
I&M	$	150	March 2013
OPCo		2,102	June 2013
SWEPCo		4,448	March 2013

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 2013 to March 2014
I&M		77,000		77,886	March 2013
OPCo		50,000		50,575	March 2013

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,132
I&M		2,426
OPCo		3,556
PSO		1,167
SWEPCo		2,559

Public Service Co Of Oklahoma [Member]

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,132
I&M		2,426
OPCo		3,556
PSO		1,167
SWEPCo		2,559

Southwestern Electric Power Co [Member]

Maximum Future Payments of Letters of Credit

Company	Amount		Maturity
	(in thousands)
I&M	$	150	March 2013
OPCo		2,102	June 2013
SWEPCo		4,448	March 2013

Maximum Potential Loss on Master Lease Agreements

	Maximum
Company	Potential Loss
	(in thousands)
APCo	$	3,132
I&M		2,426
OPCo		3,556
PSO		1,167
SWEPCo		2,559