Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2021

AEP


	Pension Plans				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	32.3	$	28.0	$	2.4	$	2.5
Interest Cost	34.3		41.9		7.6		10.0
Expected Return on Plan Assets	(57.4)		(66.2)		(22.8)		(24.0)
Amortization of Prior Service Credit	—		—		(17.7)		(17.5)
Amortization of Net Actuarial Loss	25.4		23.4		—		1.5
Net Periodic Benefit Cost (Credit)	$	34.6	$	27.1	$	(30.5)	$	(27.5)

	Pension Plans				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	64.6	$	56.0	$	4.8	$	5.0
Interest Cost	68.6		83.9		15.2		19.9
Expected Return on Plan Assets	(114.9)		(132.4)		(45.6)		(47.9)
Amortization of Prior Service Credit	—		—		(35.4)		(34.9)
Amortization of Net Actuarial Loss	50.8		46.8		—		3.0
Net Periodic Benefit Cost (Credit)	$	69.1	$	54.3	$	(61.0)	$	(54.9)

AEP Texas


	Pension Plans				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	2.9	$	2.4	$	0.1	$	0.2
Interest Cost	2.8		3.5		0.6		0.8
Expected Return on Plan Assets	(4.8)		(5.7)		(1.8)		(2.0)
Amortization of Prior Service Credit	—		—		(1.5)		(1.6)
Amortization of Net Actuarial Loss	2.0		2.0		—		0.2
Net Periodic Benefit Cost (Credit)	$	2.9	$	2.2	$	(2.6)	$	(2.4)

	Pension Plans				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	5.9	$	5.0	$	0.3	$	0.4
Interest Cost	5.6		7.0		1.2		1.6
Expected Return on Plan Assets	(9.7)		(11.4)		(3.7)		(4.0)
Amortization of Prior Service Credit	—		—		(3.0)		(3.0)
Amortization of Net Actuarial Loss	4.1		3.9		—		0.3
Net Periodic Benefit Cost (Credit)	$	5.9	$	4.5	$	(5.2)	$	(4.7)

APCo


	Pension Plans				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	2.9	$	2.6	$	0.2	$	0.2
Interest Cost	4.1		5.1		1.2		1.7
Expected Return on Plan Assets	(7.2)		(8.4)		(3.3)		(3.7)
Amortization of Prior Service Credit	—		—		(2.6)		(2.6)
Amortization of Net Actuarial Loss	3.0		2.8		—		0.3
Net Periodic Benefit Cost (Credit)	$	2.8	$	2.1	$	(4.5)	$	(4.1)

	Pension Plans				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	5.9	$	5.2	$	0.5	$	0.5
Interest Cost	8.2		10.2		2.4		3.3
Expected Return on Plan Assets	(14.5)		(16.8)		(6.7)		(7.3)
Amortization of Prior Service Credit	—		—		(5.2)		(5.1)
Amortization of Net Actuarial Loss	6.0		5.6		—		0.5
Net Periodic Benefit Cost (Credit)	$	5.6	$	4.2	$	(9.0)	$	(8.1)

I&M


	Pension Plans				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	4.3	$	3.8	$	0.3	$	0.4
Interest Cost	4.1		4.9		0.9		1.1
Expected Return on Plan Assets	(7.2)		(8.3)		(2.8)		(2.9)
Amortization of Prior Service Credit	—		—		(2.4)		(2.4)
Amortization of Net Actuarial Loss	3.0		2.7		—		0.2
Net Periodic Benefit Cost (Credit)	$	4.2	$	3.1	$	(4.0)	$	(3.6)

	Pension Plans				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	8.7	$	7.7	$	0.6	$	0.7
Interest Cost	8.1		9.8		1.8		2.3
Expected Return on Plan Assets	(14.4)		(16.6)		(5.6)		(5.8)
Amortization of Prior Service Credit	—		—		(4.8)		(4.8)
Amortization of Net Actuarial Loss	5.9		5.4		—		0.4
Net Periodic Benefit Cost (Credit)	$	8.3	$	6.3	$	(8.0)	$	(7.2)

OPCo


	Pension Plans				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	2.8	$	2.4	$	0.2	$	0.3
Interest Cost	3.1		3.8		0.8		1.1
Expected Return on Plan Assets	(5.5)		(6.5)		(2.5)		(2.7)
Amortization of Prior Service Credit	—		—		(1.8)		(1.7)
Amortization of Net Actuarial Loss	2.3		2.2		—		0.1
Net Periodic Benefit Cost (Credit)	$	2.7	$	1.9	$	(3.3)	$	(2.9)

	Pension Plans				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	5.7	$	4.8	$	0.4	$	0.5
Interest Cost	6.2		7.7		1.6		2.1
Expected Return on Plan Assets	(11.1)		(13.1)		(4.9)		(5.3)
Amortization of Prior Service Credit	—		—		(3.6)		(3.5)
Amortization of Net Actuarial Loss	4.5		4.3		—		0.3
Net Periodic Benefit Cost (Credit)	$	5.3	$	3.7	$	(6.5)	$	(5.9)

PSO


	Pension Plans				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	2.1	$	1.8	$	0.1	$	0.1
Interest Cost	1.6		2.2		0.4		0.5
Expected Return on Plan Assets	(3.1)		(3.7)		(1.2)		(1.3)
Amortization of Prior Service Credit	—		—		(1.1)		(1.1)
Amortization of Net Actuarial Loss	1.2		1.2		—		0.1
Net Periodic Benefit Cost (Credit)	$	1.8	$	1.5	$	(1.8)	$	(1.7)

	Pension Plans				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	4.0	$	3.6	$	0.3	$	0.3
Interest Cost	3.3		4.3		0.8		1.0
Expected Return on Plan Assets	(6.2)		(7.3)		(2.5)		(2.6)
Amortization of Prior Service Credit	—		—		(2.2)		(2.2)
Amortization of Net Actuarial Loss	2.5		2.4		—		0.2
Net Periodic Benefit Cost (Credit)	$	3.6	$	3.0	$	(3.6)	$	(3.3)

SWEPCo


	Pension Plans				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	2.8	$	2.4	$	0.2	$	0.2
Interest Cost	2.1		2.6		0.5		0.7
Expected Return on Plan Assets	(3.4)		(3.9)		(1.5)		(1.7)
Amortization of Prior Service Credit	—		—		(1.3)		(1.3)
Amortization of Net Actuarial Loss	1.6		1.4		—		0.1
Net Periodic Benefit Cost (Credit)	$	3.1	$	2.5	$	(2.1)	$	(2.0)

	Pension Plans				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Service Cost	$	5.7	$	4.9	$	0.3	$	0.4
Interest Cost	4.2		5.1		1.0		1.3
Expected Return on Plan Assets	(6.8)		(7.8)		(3.0)		(3.2)
Amortization of Prior Service Credit	—		—		(2.6)		(2.6)
Amortization of Net Actuarial Loss	3.1		2.8		—		0.2
Net Periodic Benefit Cost (Credit)	$	6.2	$	5.0	$	(4.3)	$	(3.9)