Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2014

Components of Net Periodic Benefit Cost

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended September 30,						Three Months Ended September 30,
	2014			2013			2014			2013
	(in millions)
Service Cost	$	18		$	17		$	4		$	5
Interest Cost	55			51			16			18
Expected Return on Plan Assets	(65		)	(69		)	(28		)	(27		)
Amortization of Prior Service Cost (Credit)	1			1			(18		)	(17		)
Amortization of Net Actuarial Loss	31			45			6			16
Net Periodic Benefit Cost (Credit)	$	40		$	45		$	(20	)	$	(5	)

	Pension Plans						Other Postretirement Benefit Plans
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in millions)
Service Cost	$	54		$	52		$	11		$	17
Interest Cost	166			152			50			53
Expected Return on Plan Assets	(196		)	(208		)	(84		)	(80		)
Amortization of Prior Service Cost (Credit)	2			2			(52		)	(52		)
Amortization of Net Actuarial Loss	93			137			17			48
Net Periodic Benefit Cost (Credit)	$	119		$	135		$	(58	)	$	(14	)

Appalachian Power Co [Member]

Components of Net Periodic Benefit Cost

APCo

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended September 30,						Three Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	1,759		$	1,543		$	362		$	641
Interest Cost	7,406			6,916			3,197			3,363
Expected Return on Plan Assets	(8,482		)	(9,260		)	(4,634		)	(4,537		)
Amortization of Prior Service Cost (Credit)	49			49			(2,512		)	(2,512		)
Amortization of Net Actuarial Loss	4,149			6,256			1,145			3,063
Net Periodic Benefit Cost (Credit)	$	4,881		$	5,504		$	(2,442	)	$	18

	Pension Plans						Other Postretirement Benefit Plans
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	5,277		$	4,628		$	1,086		$	1,924
Interest Cost	22,218			20,747			9,591			10,090
Expected Return on Plan Assets	(25,445		)	(27,780		)	(13,900		)	(13,610		)
Amortization of Prior Service Cost (Credit)	148			148			(7,537		)	(7,537		)
Amortization of Net Actuarial Loss	12,445			18,769			3,436			9,187
Net Periodic Benefit Cost (Credit)	$	14,643		$	16,512		$	(7,324	)	$	54

Indiana Michigan Power Co [Member]

Components of Net Periodic Benefit Cost

I&M

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended September 30,						Three Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	2,517		$	2,183		$	486		$	804
Interest Cost	6,573			6,025			1,909			2,056
Expected Return on Plan Assets	(7,749		)	(8,206		)	(3,363		)	(3,295		)
Amortization of Prior Service Cost (Credit)	49			49			(2,355		)	(2,356		)
Amortization of Net Actuarial Loss	3,647			5,422			592			1,882
Net Periodic Benefit Cost (Credit)	$	5,037		$	5,473		$	(2,731	)	$	(909	)

	Pension Plans						Other Postretirement Benefit Plans
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	7,551		$	6,551		$	1,460		$	2,414
Interest Cost	19,720			18,075			5,728			6,166
Expected Return on Plan Assets	(23,245		)	(24,619		)	(10,090		)	(9,887		)
Amortization of Prior Service Cost (Credit)	146			146			(7,066		)	(7,066		)
Amortization of Net Actuarial Loss	10,939			16,266			1,776			5,645
Net Periodic Benefit Cost (Credit)	$	15,111		$	16,419		$	(8,192	)	$	(2,728	)

Ohio Power Co [Member]

Components of Net Periodic Benefit Cost

OPCo

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended September 30,						Three Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	1,285		$	2,362		$	256		$	1,028
Interest Cost	5,527			10,268			1,900			4,100
Expected Return on Plan Assets	(6,607		)	(15,103		)	(3,379		)	(6,221		)
Amortization of Prior Service Cost (Credit)	40			71			(1,731		)	(3,219		)
Amortization of Net Actuarial Loss	3,105			9,287			595			3,761
Net Periodic Benefit Cost (Credit)	$	3,350		$	6,885		$	(2,359	)	$	(551	)

	Pension Plans						Other Postretirement Benefit Plans
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	3,855		$	7,107		$	769		$	3,627
Interest Cost	16,579			30,852			5,701			12,994
Expected Return on Plan Assets	(19,820		)	(45,386		)	(10,139		)	(18,698		)
Amortization of Prior Service Cost (Credit)	118			212			(5,192		)	(9,680		)
Amortization of Net Actuarial Loss	9,316			27,905			1,785			11,843
Net Periodic Benefit Cost (Credit)	$	10,048		$	20,690		$	(7,076	)	$	86

Public Service Co Of Oklahoma [Member]

Components of Net Periodic Benefit Cost

PSO

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended September 30,						Three Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	1,301		$	1,391		$	209		$	343
Interest Cost	3,015			2,748			893			948
Expected Return on Plan Assets	(3,651		)	(3,919		)	(1,575		)	(1,522		)
Amortization of Prior Service Cost (Credit)	74			75			(1,072		)	(1,072		)
Amortization of Net Actuarial Loss	1,689			2,461			278			869
Net Periodic Benefit Cost (Credit)	$	2,428		$	2,756		$	(1,267	)	$	(434	)

	Pension Plans						Other Postretirement Benefit Plans
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	3,905		$	4,172		$	629		$	1,029
Interest Cost	9,043			8,245			2,680			2,844
Expected Return on Plan Assets	(10,953		)	(11,756		)	(4,725		)	(4,566		)
Amortization of Prior Service Cost (Credit)	222			223			(3,217		)	(3,217		)
Amortization of Net Actuarial Loss	5,065			7,383			832			2,607
Net Periodic Benefit Cost (Credit)	$	7,282		$	8,267		$	(3,801	)	$	(1,303	)

Southwestern Electric Power Co [Member]

Components of Net Periodic Benefit Cost

SWEPCo

	Pension Plans						Other Postretirement Benefit Plans
	Three Months Ended September 30,						Three Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	1,655		$	1,752		$	253		$	424
Interest Cost	3,163			2,864			998			1,075
Expected Return on Plan Assets	(3,857		)	(4,126		)	(1,754		)	(1,720		)
Amortization of Prior Service Cost (Credit)	87			87			(1,289		)	(1,289		)
Amortization of Net Actuarial Loss	1,762			2,553			309			982
Net Periodic Benefit Cost (Credit)	$	2,810		$	3,130		$	(1,483	)	$	(528	)

	Pension Plans						Other Postretirement Benefit Plans
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Service Cost	$	4,964		$	5,258		$	759		$	1,270
Interest Cost	9,488			8,591			2,994			3,226
Expected Return on Plan Assets	(11,571		)	(12,381		)	(5,262		)	(5,160		)
Amortization of Prior Service Cost (Credit)	262			262			(3,867		)	(3,867		)
Amortization of Net Actuarial Loss	5,285			7,660			926			2,946
Net Periodic Benefit Cost (Credit)	$	8,428		$	9,390		$	(4,450	)	$	(1,585	)