Property, Plant and Equipment Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2015

Asset Retirement Obligation (ARO)

	Carrying Amount of ARO
	(in millions)
ARO as of December 31, 2014	$	2,019
Accretion Expense	50
Liabilities Incurred	47
Liabilities Settled	(22		)
Revisions in Cash Flow Estimates	48
ARO as of June 30, 2015	$	2,142

Appalachian Power Co [Member]

Asset Retirement Obligation (ARO)

	ARO as of									Revisions in
	December 31,		Accretion		Liabilities		Liabilities			Cash Flow		ARO as of
Company	2014		Expense		Incurred		Settled			Estimates		June 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	4,122	$	—	$	(10,503	)	$	13,962	$	155,958
I&M (a)(b)(d)	1,342,549		31,731		—		(1,222		)	5,639		1,378,697
OPCo (d)(e)	1,361		41		—		(8		)	—		1,394
PSO (a)(d)	38,020		1,214		5,336		(115		)	1,916		46,371
SWEPCo (a)(c)(d)	94,394		2,725		12,191		(2,189		)	6,348		113,469

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.3 billion as of June 30, 2015 and December 31, 2014.

(c) Includes ARO related to Sabine and DHLC.

(d) Includes ARO related to asbestos removal.

(e) Not impacted by the CCR rule.

Indiana Michigan Power Co [Member]

Asset Retirement Obligation (ARO)

	ARO as of									Revisions in
	December 31,		Accretion		Liabilities		Liabilities			Cash Flow		ARO as of
Company	2014		Expense		Incurred		Settled			Estimates		June 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	4,122	$	—	$	(10,503	)	$	13,962	$	155,958
I&M (a)(b)(d)	1,342,549		31,731		—		(1,222		)	5,639		1,378,697
OPCo (d)(e)	1,361		41		—		(8		)	—		1,394
PSO (a)(d)	38,020		1,214		5,336		(115		)	1,916		46,371
SWEPCo (a)(c)(d)	94,394		2,725		12,191		(2,189		)	6,348		113,469

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.3 billion as of June 30, 2015 and December 31, 2014.

(c) Includes ARO related to Sabine and DHLC.

(d) Includes ARO related to asbestos removal.

(e) Not impacted by the CCR rule.

Ohio Power Co [Member]

Asset Retirement Obligation (ARO)

	ARO as of									Revisions in
	December 31,		Accretion		Liabilities		Liabilities			Cash Flow		ARO as of
Company	2014		Expense		Incurred		Settled			Estimates		June 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	4,122	$	—	$	(10,503	)	$	13,962	$	155,958
I&M (a)(b)(d)	1,342,549		31,731		—		(1,222		)	5,639		1,378,697
OPCo (d)(e)	1,361		41		—		(8		)	—		1,394
PSO (a)(d)	38,020		1,214		5,336		(115		)	1,916		46,371
SWEPCo (a)(c)(d)	94,394		2,725		12,191		(2,189		)	6,348		113,469

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.3 billion as of June 30, 2015 and December 31, 2014.

(c) Includes ARO related to Sabine and DHLC.

(d) Includes ARO related to asbestos removal.

(e) Not impacted by the CCR rule.

Public Service Co Of Oklahoma [Member]

Asset Retirement Obligation (ARO)

	ARO as of									Revisions in
	December 31,		Accretion		Liabilities		Liabilities			Cash Flow		ARO as of
Company	2014		Expense		Incurred		Settled			Estimates		June 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	4,122	$	—	$	(10,503	)	$	13,962	$	155,958
I&M (a)(b)(d)	1,342,549		31,731		—		(1,222		)	5,639		1,378,697
OPCo (d)(e)	1,361		41		—		(8		)	—		1,394
PSO (a)(d)	38,020		1,214		5,336		(115		)	1,916		46,371
SWEPCo (a)(c)(d)	94,394		2,725		12,191		(2,189		)	6,348		113,469

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.3 billion as of June 30, 2015 and December 31, 2014.

(c) Includes ARO related to Sabine and DHLC.

(d) Includes ARO related to asbestos removal.

(e) Not impacted by the CCR rule.

Southwestern Electric Power Co [Member]

Asset Retirement Obligation (ARO)

	ARO as of									Revisions in
	December 31,		Accretion		Liabilities		Liabilities			Cash Flow		ARO as of
Company	2014		Expense		Incurred		Settled			Estimates		June 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	4,122	$	—	$	(10,503	)	$	13,962	$	155,958
I&M (a)(b)(d)	1,342,549		31,731		—		(1,222		)	5,639		1,378,697
OPCo (d)(e)	1,361		41		—		(8		)	—		1,394
PSO (a)(d)	38,020		1,214		5,336		(115		)	1,916		46,371
SWEPCo (a)(c)(d)	94,394		2,725		12,191		(2,189		)	6,348		113,469

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.3 billion as of June 30, 2015 and December 31, 2014.

(c) Includes ARO related to Sabine and DHLC.

(d) Includes ARO related to asbestos removal.

(e) Not impacted by the CCR rule.