v3.26.1
BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
Pension Plans

Three Months Ended June 30, 2026AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$26 $3 $3 $2 $3 $1 $3 
Interest Cost52 4 6 6 4 2 3 
Expected Return on Plan Assets(63)(5)(8)(8)(7)(3)(3)
Amortization of Net Actuarial Loss11 1 1 1 1 1 — 
Settlements (a)4 (4)— — — 4 — 
Net Periodic Benefit Cost (Credit)$30 $(1)$2 $1 $1 $5 $3 

Three Months Ended June 30, 2025AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$24 $2 $2 $2 $3 $2 $2 
Interest Cost53 4 7 7 4 2 3 
Expected Return on Plan Assets(71)(5)(10)(10)(8)(3)(3)
Amortization of Net Actuarial Loss4 1 — 1 1 — — 
Net Periodic Benefit Cost (Credit)$10 $2 $(1)$— $— $1 $2 

Six Months Ended June 30, 2026AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$51 $5 $5 $5 $5 $3 $5 
Interest Cost103 8 12 12 9 5 6 
Expected Return on Plan Assets(128)(10)(16)(16)(13)(7)(7)
Amortization of Net Actuarial Loss21 2 2 2 2 1 1 
Settlements (a)(7)(8)— — (6)4 — 
Net Periodic Benefit Cost (Credit)$40 $(3)$3 $3 $(3)$6 $5 

Six Months Ended June 30, 2025AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$48 $4 $4 $5 $5 $3 $4 
Interest Cost106 9 13 13 9 5 6 
Expected Return on Plan Assets(141)(11)(19)(19)(15)(7)(7)
Amortization of Net Actuarial Loss8 1 1 1 1 — — 
Net Periodic Benefit Cost (Credit)$21 $3 $(1)$— $— $1 $3 

(a)Represents deferrals of regulatory activity.
OPEB

Three Months Ended June 30, 2026AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$1 $— $— $— $— $— $— 
Interest Cost7 — 1 1 1 1 — 
Expected Return on Plan Assets(30)(2)(4)(3)(2)(2)(2)
Amortization of Prior Service Credit— — — — — — — 
Amortization of Net Actuarial Gain— — — — — — — 
Net Periodic Benefit Credit$(22)$(2)$(3)$(2)$(1)$(1)$(2)

Three Months Ended June 30, 2025AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$1 $1 $— $— $— $— $— 
Interest Cost9 — 2 1 1 1 — 
Expected Return on Plan Assets(28)(2)(5)(4)(3)(2)(2)
Amortization of Prior Service Credit(1)— — — — — — 
Net Periodic Benefit Credit$(19)$(1)$(3)$(3)$(2)$(1)$(2)

Six Months Ended June 30, 2026AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$2 $— $— $— $— $— $— 
Interest Cost15 1 2 2 1 1 1 
Expected Return on Plan Assets(59)(5)(8)(7)(5)(3)(4)
Amortization of Prior Service Credit(1)— — — — — — 
Amortization of Net Actuarial Gain(1)— — — — — — 
Net Periodic Benefit Credit$(44)$(4)$(6)$(5)$(4)$(2)$(3)

Six Months Ended June 30, 2025AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$2 $1 $— $— $— $— $— 
Interest Cost17 1 3 2 2 1 1 
Expected Return on Plan Assets(56)(5)(9)(7)(6)(3)(4)
Amortization of Prior Service Credit(1)— — — — — — 
Amortization of Net Actuarial Loss(1)— — — — — — 
Net Periodic Benefit Credit$(39)$(3)$(6)$(5)$(4)$(2)$(3)
Qualified Pension Contribution The following table provides details of the contribution by Registrant:
CompanyQualified Pension Plan
(in millions)
AEP$95 
AEP Texas12 
APCo— 
I&M2 
PSO1 
SWEPCo9