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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY (Tables)
 12 Months Ended
Dec. 31, 2025
Condensed Financial Information Disclosure [Abstract]  
Schedule of Long-term Debt
The following table details long-term debt outstanding:
Weighted-AverageInterest Rate Ranges as ofOutstanding as of
Interest Rate as ofDecember 31,December 31,
CompanyMaturityDecember 31, 20252025202420252024
AEP(in millions)
Senior Unsecured Notes 2026-20554.45%1.63%-8.13%1.00%-8.13%$37,190 $36,411 
Pollution Control Bonds (a)2026-2038 (b)3.62%2.40%-4.70%0.63%-4.70%1,637 1,771 
Notes Payable – Nonaffiliated (c)2026-20345.97%2.43%-6.89%0.93%-6.89%683 610 
Securitization Bonds2028-2045 (d)4.71%2.29%-5.30%2.06%-4.88%984 578 
Spent Nuclear Fuel Obligation (e)330 316 
Junior Subordinated Notes2027-20545.83%3.88%-7.05%3.88%-7.05%4,681 2,579 
Other Long-term Debt2026-20594.88%3.00%-13.72%3.00%-13.72%1,817 378 
Total Long-term Debt Outstanding$47,322 $42,643 
AEP Texas
Senior Unsecured Notes2026-20554.62%2.10%-6.76%2.10%-6.76%$6,472 $5,874 
Pollution Control Bonds (a)2029-2030 (b)3.88%2.60%-4.55%2.60%-4.55%441 440 
Securitization Bonds2029 (d)2.29%2.29%2.06%-2.29%102 127 
Other Long-term Debt20594.50%4.50%4.50%1 1 
Total Long-term Debt Outstanding
$7,016 $6,442 
AEPTCo
Senior Unsecured Notes2026-20534.21%2.75%-5.52%2.75%-5.52%$6,100 $5,768 
Other Long-term Debt20284.83%4.83%—%499 — 
Total Long-term Debt Outstanding
$6,599 $5,768 
APCo
Senior Unsecured Notes2027-20504.84%2.70%-7.00%2.70%-7.00%$4,688 $4,984 
Pollution Control Bonds (a)2028-2038 (b)3.92%3.30%-3.70%0.63%-4.22%379 430 
Securitization Bonds2028 (d)3.77%3.77%3.77%92 120 
Other Long-term Debt2026-20284.89%4.83%-13.72%5.75%-13.72%1,100 127 
Total Long-term Debt Outstanding
$6,259 $5,661 
I&M
Senior Unsecured Notes2028-20534.52%3.25%-6.05%3.25%-6.05%$2,847 $2,845 
Pollution Control Bonds (a)2029 (b)3.70%3.70%0.75%-3.05%149 190 
Notes Payable – Nonaffiliated (c)2026-20305.24%3.44%-6.41%0.93%-6.41%235 143 
Spent Nuclear Fuel Obligation (e)330 316 
Total Long-term Debt Outstanding
$3,561 $3,494 
OPCo
Senior Unsecured Notes2030-20514.16%1.63%-6.60%1.63%-6.60%$3,718 $3,716 
Total Long-term Debt Outstanding
$3,718 $3,716 
PSO
Senior Unsecured Notes2026-20514.59%2.20%-6.63%2.20%-6.63%$3,525 $2,854 
Other Long-term Debt20273.00%3.00%3.00%1 2 
Total Long-term Debt Outstanding
$3,526 $2,856 
SWEPCo
Senior Unsecured Notes2026-20513.73%1.65%-6.20%1.65%-6.20%$3,653 $3,650 
Notes Payable – Affiliated20284.24%4.24%—%1,000 — 
Securitization Bonds2039 (d)4.88%4.88%4.88%321 331 
Total Long-term Debt Outstanding
$4,974 $3,981 

(a)For certain series of Pollution Control Bonds, interest rates are subject to periodic adjustment.  Certain series may be purchased on demand at periodic interest adjustment dates.  Letters of credit from banks and insurance policies support certain series. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year - Nonaffiliated on the balance sheets.
(b)Certain Pollution Control Bonds are subject to redemption earlier than the maturity date.
(c)Notes payable represent outstanding promissory notes issued under term loan agreements and credit agreements with a number of banks and other financial institutions. At expiration, all notes then issued and outstanding are due and payable. Interest rates are both fixed and variable. Variable rates generally relate to specified short-term interest rates.
(d)Dates represent the scheduled final payment dates for the securitization bonds. The legal maturity date is one to two years later. These bonds have been classified for maturity and repayment purposes based on the scheduled final payment date.
(e)Spent Nuclear Fuel Obligation consists of a liability along with accrued interest for disposal of SNF. See “Spent Nuclear Fuel Disposal” section of Note 6 for additional information.
The following details long-term debt outstanding as of December 31, 2025 and 2024:

Long-term Debt
 Weighted-AverageInterest Rate Ranges as ofOutstanding as of
Interest Rate as ofDecember 31,December 31,
Type of DebtMaturityDecember 31, 20252025202420252024
    (in millions)
Senior Unsecured Notes2027-20504.58%
1.80%-5.95%
1.00%-5.95%
$4,882 $5,290 
Pollution Control Bonds2026-2029 (a)3.12%
2.40%-3.75%
2.40%-3.75%
537 537 
Junior Subordinated Notes2027-20545.83%
3.88%-7.05%
3.88%-7.05%
4,681 2,579 
Total Long-term Debt Outstanding   10,100 8,406 
Long-term Debt Due Within One Year50 1,282 
Long-term Debt$10,050 $7,124 

(a)Certain Pollution Control Bonds are subject to redemption earlier than the maturity date.

Long-term debt outstanding as of December 31, 2025 is payable as follows:
20262027202820292030After 2030Total
 (in millions)
Principal Amount (a)$50 $1,774 $930 $1,695 $400 $5,350 $10,199 
Unamortized Discount, Net and Debt Issuance Costs      (99)
Total Long-term Debt Outstanding      $10,100 

(a)Amounts reflect the impact of fair value hedge accounting. See “Accounting for Fair Value Hedging Strategies” section of Note 10 included in the 2025 Annual Report for additional information.
Schedule of Short-term Debt AEP’s outstanding short-term debt was as follows:
December 31,
20252024
CompanyType of DebtOutstanding
Amount		Interest
Rate (a)		Outstanding
Amount		Interest
Rate (a)
(in millions)(in millions)
AEPSecuritized Debt for Receivables (b)$900 4.00 %$900 4.73 %
AEPCommercial Paper605 3.92 %1,618 4.70 %
SWEPCoNotes Payable3 6.30 %6 6.69 %
Total Short-term Debt$1,508 $2,524 

(a)    Weighted-average rate of all borrowings outstanding as of December 31, 2025 and 2024, respectively.
(b)    Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.
Parent’s outstanding short-term debt was as follows:
 December 31, 2025December 31, 2024
Type of DebtOutstanding
Amount		Weighted-Average
Interest Rate		Outstanding
Amount		Weighted-Average
Interest Rate
 (in millions) (in millions) 
Commercial Paper$605 3.92 %$1,618 4.70 %
Total Short-term Debt$605 $1,618