CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - SWEPCo - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
OPERATING ACTIVITIES
Net Income	$ 903	$ 802
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	907	833
Deferred Income Taxes	188	165
Asset Impairments and Other Related Charges	31	0
Allowance for Equity Funds Used During Construction	(70)	(57)
Mark-to-Market of Risk Management Contracts	100	(15)
Property Taxes	(108)	(88)
Deferred Fuel Over/Under-Recovery, Net	(122)	(75)
Change in Other Noncurrent Assets	(351)	(131)
Change in Other Noncurrent Liabilities	433	142
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(36)	(2)
Fuel, Materials and Supplies	(39)	139
Accounts Payable	108	6
Accrued Taxes, Net	(244)	(153)
Other Current Assets	(115)	(23)
Other Current Liabilities	(66)	(93)
Net Cash Flows from Operating Activities	1,519	1,450
INVESTING ACTIVITIES
Construction Expenditures	(2,830)	(2,100)
Other Investing Activities	(1)	(5)
Net Cash Flows Used for Investing Activities	(3,569)	(2,102)
FINANCING ACTIVITIES
Issuance of Long-term Debt	2,906	562
Change in Short-term Debt – Nonaffiliated	47	752
Retirement of Long-term Debt – Nonaffiliated	(678)	(229)
Principal Payments for Finance Lease Obligations	(24)	(13)
Dividends Paid to Noncontrolling Interest	(35)	(1)
Net Cash Flows from (Used for) Financing Activities	2,121	698
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	71	46
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	268	246
Cash, Cash Equivalents and Restricted Cash at End of Period	339	292
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	450	350
Noncash Acquisitions Under Finance Leases	24	8
Construction Expenditures Included in Current Liabilities as of March 31,	1,434	1,041
SOUTHWESTERN ELECTRIC POWER COMPANY
OPERATING ACTIVITIES
Net Income	57	49
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	121	98
Deferred Income Taxes	1	37
Asset Impairments and Other Related Charges	31	0
Allowance for Equity Funds Used During Construction	(8)	(3)
Mark-to-Market of Risk Management Contracts	23	(2)
Property Taxes	(84)	(75)
Deferred Fuel Over/Under-Recovery, Net	6	23
Change in Other Noncurrent Assets	(75)	(21)
Change in Other Noncurrent Liabilities	(15)	(9)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(47)	7
Fuel, Materials and Supplies	(19)	13
Accounts Payable	30	(7)
Accrued Taxes, Net	16	49
Other Current Assets	(10)	(1)
Other Current Liabilities	(24)	(39)
Net Cash Flows from Operating Activities	3	119
INVESTING ACTIVITIES
Construction Expenditures	(345)	(235)
Change in Advances to Affiliates, Net	23	0
Other Investing Activities	6	0
Net Cash Flows Used for Investing Activities	(316)	(235)
FINANCING ACTIVITIES
Capital Contribution from Parent	128	0
Issuance of Long-term Debt	1,393	0
Change in Short-term Debt – Nonaffiliated	1	3
Change in Advances from Affiliates, Net	293	125
Principal Payments for Finance Lease Obligations	(1)	(1)
Dividends Paid to Noncontrolling Interest	(1)	(1)
Net Cash Flows from (Used for) Financing Activities	305	126
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(8)	10
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	17	5
Cash, Cash Equivalents and Restricted Cash at End of Period	9	15
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	50	39
Noncash Acquisitions Under Finance Leases	0	1
Construction Expenditures Included in Current Liabilities as of March 31,	195	89
SOUTHWESTERN ELECTRIC POWER COMPANY | Nonrelated Party
FINANCING ACTIVITIES
Retirement of Long-term Debt – Nonaffiliated	(508)	0
SOUTHWESTERN ELECTRIC POWER COMPANY | Affiliated Entity
FINANCING ACTIVITIES
Retirement of Long-term Debt – Nonaffiliated	$ (1,000)	$ 0