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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2020
Components of Net Periodic Benefit Cost
AEP
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$28.0 $23.8 $2.5 $2.4 
Interest Cost42.0 51.1 10.0 12.6 
Expected Return on Plan Assets(66.3)(74.0)(23.9)(23.4)
Amortization of Prior Service Credit— — (17.4)(17.3)
Amortization of Net Actuarial Loss23.5 14.4 1.4 5.5 
Net Periodic Benefit Cost (Credit)$27.2 $15.3 $(27.4)$(20.2)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$84.0 $71.6 $7.5 $7.1 
Interest Cost125.9 153.3 29.9 37.9 
Expected Return on Plan Assets(198.7)(222.0)(71.8)(70.3)
Amortization of Prior Service Credit— — (52.3)(51.8)
Amortization of Net Actuarial Loss70.3 43.2 4.4 16.6 
Net Periodic Benefit Cost (Credit)$81.5 $46.1 $(82.3)$(60.5)
AEP Texas
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$2.6 $2.2 $0.2 $0.1 
Interest Cost3.5 4.4 0.8 1.0 
Expected Return on Plan Assets(5.7)(6.5)(2.0)(1.9)
Amortization of Prior Service Credit— — (1.4)(1.5)
Amortization of Net Actuarial Loss1.9 1.2 0.1 0.5 
Net Periodic Benefit Cost (Credit)$2.3 $1.3 $(2.3)$(1.8)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$7.6 $6.5 $0.6 $0.5 
Interest Cost10.5 13.1 2.4 3.0 
Expected Return on Plan Assets(17.1)(19.4)(6.0)(5.8)
Amortization of Prior Service Credit— — (4.4)(4.4)
Amortization of Net Actuarial Loss5.8 3.7 0.4 1.4 
Net Periodic Benefit Cost (Credit)$6.8 $3.9 $(7.0)$(5.3)

APCo
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$2.7 $2.4 $0.3 $0.2 
Interest Cost5.0 6.3 1.6 2.2 
Expected Return on Plan Assets(8.4)(9.4)(3.6)(3.7)
Amortization of Prior Service Credit— — (2.5)(2.5)
Amortization of Net Actuarial Loss2.8 1.8 0.2 1.0 
Net Periodic Benefit Cost (Credit)$2.1 $1.1 $(4.0)$(2.8)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$7.9 $7.1 $0.8 $0.7 
Interest Cost15.2 18.9 4.9 6.5 
Expected Return on Plan Assets(25.2)(28.1)(10.9)(11.0)
Amortization of Prior Service Credit— — (7.6)(7.5)
Amortization of Net Actuarial Loss8.4 5.3 0.7 2.8 
Net Periodic Benefit Cost (Credit)$6.3 $3.2 $(12.1)$(8.5)
I&M
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$3.9 $3.3 $0.4 $0.3 
Interest Cost4.9 6.0 1.2 1.5 
Expected Return on Plan Assets(8.3)(9.1)(3.0)(2.8)
Amortization of Prior Service Credit— — (2.3)(2.4)
Amortization of Net Actuarial Loss2.7 1.6 0.1 0.7 
Net Periodic Benefit Cost (Credit)$3.2 $1.8 $(3.6)$(2.7)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$11.6 $10.0 $1.1 $1.0 
Interest Cost14.7 17.9 3.5 4.4 
Expected Return on Plan Assets(24.9)(27.5)(8.8)(8.5)
Amortization of Prior Service Credit— — (7.1)(7.1)
Amortization of Net Actuarial Loss8.1 4.9 0.5 2.0 
Net Periodic Benefit Cost (Credit)$9.5 $5.3 $(10.8)$(8.2)

OPCo
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$2.4 $1.9 $0.2 $0.2 
Interest Cost3.9 4.8 1.0 1.4 
Expected Return on Plan Assets(6.6)(7.3)(2.6)(2.7)
Amortization of Prior Service Credit— — (1.8)(1.8)
Amortization of Net Actuarial Loss2.1 1.3 0.2 0.6 
Net Periodic Benefit Cost (Credit)$1.8 $0.7 $(3.0)$(2.3)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$7.2 $5.9 $0.7 $0.6 
Interest Cost11.6 14.3 3.1 4.1 
Expected Return on Plan Assets(19.7)(22.0)(7.9)(8.1)
Amortization of Prior Service Credit— — (5.3)(5.2)
Amortization of Net Actuarial Loss6.4 4.0 0.5 1.9 
Net Periodic Benefit Cost (Credit)$5.5 $2.2 $(8.9)$(6.7)
PSO
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$1.9 $1.6 $0.1 $0.2 
Interest Cost2.1 2.6 0.6 0.7 
Expected Return on Plan Assets(3.6)(4.0)(1.3)(1.3)
Amortization of Prior Service Credit— — (1.0)(1.1)
Amortization of Net Actuarial Loss1.1 0.7 — 0.3 
Net Periodic Benefit Cost (Credit)$1.5 $0.9 $(1.6)$(1.2)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$5.5 $4.9 $0.4 $0.5 
Interest Cost6.4 7.9 1.6 2.0 
Expected Return on Plan Assets(10.9)(12.2)(3.9)(3.9)
Amortization of Prior Service Credit— — (3.2)(3.2)
Amortization of Net Actuarial Loss3.5 2.2 0.2 0.9 
Net Periodic Benefit Cost (Credit)$4.5 $2.8 $(4.9)$(3.7)

SWEPCo
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$2.6 $2.1 $0.2 $0.2 
Interest Cost2.5 3.1 0.6 0.7 
Expected Return on Plan Assets(3.9)(4.4)(1.5)(1.5)
Amortization of Prior Service Credit— — (1.3)(1.3)
Amortization of Net Actuarial Loss1.4 0.9 0.1 0.4 
Net Periodic Benefit Cost (Credit)$2.6 $1.7 $(1.9)$(1.5)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (in millions)
Service Cost$7.5 $6.4 $0.6 $0.6 
Interest Cost7.6 9.3 1.9 2.3 
Expected Return on Plan Assets(11.7)(13.3)(4.7)(4.5)
Amortization of Prior Service Credit— — (3.9)(3.9)
Amortization of Net Actuarial Loss4.2 2.6 0.3 1.1 
Net Periodic Benefit Cost (Credit)$7.6 $5.0 $(5.8)$(4.4)
Qualified Pension Contribution
CompanyQualified Pension Plan
(in millions)
AEP$110.3 
AEP Texas11.3 
APCo7.0 
I&M6.4 
OPCo0.1 
SWEPCo8.9