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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Components of Net Periodic Benefit Cost
AEP
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$32.3 $28.0 $2.4 $2.5 
Interest Cost34.3 42.0 7.7 10.0 
Expected Return on Plan Assets(57.4)(66.3)(22.8)(23.9)
Amortization of Prior Service Credit— — (17.8)(17.4)
Amortization of Net Actuarial Loss25.3 23.5 — 1.4 
Net Periodic Benefit Cost (Credit)$34.5 $27.2 $(30.5)$(27.4)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$96.9 $84.0 $7.2 $7.5 
Interest Cost102.9 125.9 22.9 29.9 
Expected Return on Plan Assets(172.3)(198.7)(68.4)(71.8)
Amortization of Prior Service Credit— — (53.2)(52.3)
Amortization of Net Actuarial Loss76.1 70.3 — 4.4 
Net Periodic Benefit Cost (Credit)$103.6 $81.5 $(91.5)$(82.3)
AEP Texas
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$3.0 $2.6 $0.2 $0.2 
Interest Cost2.8 3.5 0.6 0.8 
Expected Return on Plan Assets(4.9)(5.7)(1.9)(2.0)
Amortization of Prior Service Credit— — (1.5)(1.4)
Amortization of Net Actuarial Loss2.1 1.9 — 0.1 
Net Periodic Benefit Cost (Credit)$3.0 $2.3 $(2.6)$(2.3)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$8.9 $7.6 $0.5 $0.6 
Interest Cost8.4 10.5 1.8 2.4 
Expected Return on Plan Assets(14.6)(17.1)(5.6)(6.0)
Amortization of Prior Service Credit— — (4.5)(4.4)
Amortization of Net Actuarial Loss6.2 5.8 — 0.4 
Net Periodic Benefit Cost (Credit)$8.9 $6.8 $(7.8)$(7.0)

APCo
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$3.0 $2.7 $0.3 $0.3 
Interest Cost4.1 5.0 1.3 1.6 
Expected Return on Plan Assets(7.3)(8.4)(3.4)(3.6)
Amortization of Prior Service Credit— — (2.6)(2.5)
Amortization of Net Actuarial Loss3.0 2.8 — 0.2 
Net Periodic Benefit Cost (Credit)$2.8 $2.1 $(4.4)$(4.0)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$8.9 $7.9 $0.8 $0.8 
Interest Cost12.3 15.2 3.7 4.9 
Expected Return on Plan Assets(21.8)(25.2)(10.1)(10.9)
Amortization of Prior Service Credit— — (7.8)(7.6)
Amortization of Net Actuarial Loss9.0 8.4 — 0.7 
Net Periodic Benefit Cost (Credit)$8.4 $6.3 $(13.4)$(12.1)
I&M
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$4.4 $3.9 $0.4 $0.4 
Interest Cost4.0 4.9 0.8 1.2 
Expected Return on Plan Assets(7.2)(8.3)(2.7)(3.0)
Amortization of Prior Service Credit— — (2.5)(2.3)
Amortization of Net Actuarial Loss2.9 2.7 — 0.1 
Net Periodic Benefit Cost (Credit)$4.1 $3.2 $(4.0)$(3.6)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$13.1 $11.6 $1.0 $1.1 
Interest Cost12.1 14.7 2.6 3.5 
Expected Return on Plan Assets(21.6)(24.9)(8.3)(8.8)
Amortization of Prior Service Credit— — (7.3)(7.1)
Amortization of Net Actuarial Loss8.8 8.1 — 0.5 
Net Periodic Benefit Cost (Credit)$12.4 $9.5 $(12.0)$(10.8)

OPCo
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$2.9 $2.4 $0.2 $0.2 
Interest Cost3.1 3.9 0.7 1.0 
Expected Return on Plan Assets(5.7)(6.6)(2.4)(2.6)
Amortization of Prior Service Credit— — (1.7)(1.8)
Amortization of Net Actuarial Loss2.3 2.1 — 0.2 
Net Periodic Benefit Cost (Credit)$2.6 $1.8 $(3.2)$(3.0)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$8.6 $7.2 $0.6 $0.7 
Interest Cost9.3 11.6 2.3 3.1 
Expected Return on Plan Assets(16.8)(19.7)(7.3)(7.9)
Amortization of Prior Service Credit— — (5.3)(5.3)
Amortization of Net Actuarial Loss6.8 6.4 — 0.5 
Net Periodic Benefit Cost (Credit)$7.9 $5.5 $(9.7)$(8.9)
PSO
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$2.0 $1.9 $0.1 $0.1 
Interest Cost1.7 2.1 0.4 0.6 
Expected Return on Plan Assets(3.0)(3.6)(1.3)(1.3)
Amortization of Prior Service Credit— — (1.1)(1.0)
Amortization of Net Actuarial Loss1.2 1.1 — — 
Net Periodic Benefit Cost (Credit)$1.9 $1.5 $(1.9)$(1.6)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$6.0 $5.5 $0.4 $0.4 
Interest Cost5.0 6.4 1.2 1.6 
Expected Return on Plan Assets(9.2)(10.9)(3.8)(3.9)
Amortization of Prior Service Credit— — (3.3)(3.2)
Amortization of Net Actuarial Loss3.7 3.5 — 0.2 
Net Periodic Benefit Cost (Credit)$5.5 $4.5 $(5.5)$(4.9)

SWEPCo
Pension PlansOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$2.7 $2.6 $0.3 $0.2 
Interest Cost2.2 2.5 0.4 0.6 
Expected Return on Plan Assets(3.3)(3.9)(1.5)(1.5)
Amortization of Prior Service Credit— — (1.4)(1.3)
Amortization of Net Actuarial Loss1.5 1.4 — 0.1 
Net Periodic Benefit Cost (Credit)$3.1 $2.6 $(2.2)$(1.9)
Pension PlansOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (in millions)
Service Cost$8.4 $7.5 $0.6 $0.6 
Interest Cost6.4 7.6 1.4 1.9 
Expected Return on Plan Assets(10.1)(11.7)(4.5)(4.7)
Amortization of Prior Service Credit— — (4.0)(3.9)
Amortization of Net Actuarial Loss4.6 4.2 — 0.3 
Net Periodic Benefit Cost (Credit)$9.3 $7.6 $(6.5)$(5.8)
  
Qualified Pension Contribution  
CompanyQualified Pension Plan
(in millions)
AEP$110.3 
AEP Texas11.3 
APCo7.0 
I&M6.4 
OPCo0.1 
SWEPCo8.9