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

9 Months Ended

Sep. 30, 2015

Asset Retirement Obligation (ARO)

	Carrying Amount of ARO
	(in millions)
ARO as of December 31, 2014	$	2,019
Accretion Expense	76
Liabilities Incurred	48
Liabilities Settled (a)	(126		)
Revisions in Cash Flow Estimates (b)	30
ARO as of September 30, 2015	$	2,047

(a) Amount includes settlement of liabilities of $81 million associated with the sale of the Muskingum River Plant site. See the "Muskingum River Plant" section of Note 6.

(b) Amount includes a $20 million reduction in the ARO liability due to the execution of a joint use agreement with a third party.

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		September 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	6,239	$	—	$	(23,471	)	$	16,977	$	148,122
I&M (a)(b)(d)	1,342,549		47,918		—		(3,977		)	5,638		1,392,128
OPCo (d)(e)	1,361		62		—		(8		)	—		1,415
PSO (a)(d)	38,020		1,923		5,336		(125		)	1,916		47,070
SWEPCo (a)(c)(d)	94,394		4,299		12,191		(3,358		)	6,349		113,875

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.31 billion and $1.27 billion as of September 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		September 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	6,239	$	—	$	(23,471	)	$	16,977	$	148,122
I&M (a)(b)(d)	1,342,549		47,918		—		(3,977		)	5,638		1,392,128
OPCo (d)(e)	1,361		62		—		(8		)	—		1,415
PSO (a)(d)	38,020		1,923		5,336		(125		)	1,916		47,070
SWEPCo (a)(c)(d)	94,394		4,299		12,191		(3,358		)	6,349		113,875

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.31 billion and $1.27 billion as of September 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		September 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	6,239	$	—	$	(23,471	)	$	16,977	$	148,122
I&M (a)(b)(d)	1,342,549		47,918		—		(3,977		)	5,638		1,392,128
OPCo (d)(e)	1,361		62		—		(8		)	—		1,415
PSO (a)(d)	38,020		1,923		5,336		(125		)	1,916		47,070
SWEPCo (a)(c)(d)	94,394		4,299		12,191		(3,358		)	6,349		113,875

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.31 billion and $1.27 billion as of September 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		September 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	6,239	$	—	$	(23,471	)	$	16,977	$	148,122
I&M (a)(b)(d)	1,342,549		47,918		—		(3,977		)	5,638		1,392,128
OPCo (d)(e)	1,361		62		—		(8		)	—		1,415
PSO (a)(d)	38,020		1,923		5,336		(125		)	1,916		47,070
SWEPCo (a)(c)(d)	94,394		4,299		12,191		(3,358		)	6,349		113,875

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.31 billion and $1.27 billion as of September 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		September 30, 2015
	(in thousands)
APCo (a)(d)	$	148,377	$	6,239	$	—	$	(23,471	)	$	16,977	$	148,122
I&M (a)(b)(d)	1,342,549		47,918		—		(3,977		)	5,638		1,392,128
OPCo (d)(e)	1,361		62		—		(8		)	—		1,415
PSO (a)(d)	38,020		1,923		5,336		(125		)	1,916		47,070
SWEPCo (a)(c)(d)	94,394		4,299		12,191		(3,358		)	6,349		113,875

(a) Includes ARO related to ash disposal facilities.

(b) Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.31 billion and $1.27 billion as of September 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.