CONDENSED CONSOLIDATED BALANCE SHEETS - SWEPCo (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Restricted Cash	$ 33	$ 71
Materials and Supplies	1,098	1,046
Other Property, Plant and Equipment	9,119	8,635
Accumulated Depreciation and Amortization	28,453	28,205
Securitized Assets	912	933
Long-term Debt Due Within One Year	2,704	3,194
Long-term Debt	$ 46,850	$ 44,128
Common Stock – Par Value (in dollars per share)	$ 6.50	$ 6.50
Common Stock – Shares Authorized (in shares)	600,000,000	600,000,000
Subsidiaries
Restricted Cash	$ 33	$ 71
Long-term Debt Due Within One Year	200	207
Long-term Debt	1,246	1,294
SOUTHWESTERN ELECTRIC POWER COMPANY
Restricted Cash	7	15
Materials and Supplies	93	88
Other Property, Plant and Equipment	930	942
Accumulated Depreciation and Amortization	3,534	3,478
Securitized Assets	311	315
Long-term Debt Due Within One Year	$ 417	$ 917
Common Stock – Par Value (in dollars per share)	$ 18	$ 18
Common Stock – Shares Authorized (in shares)	3,680	3,680
Common Stock – Shares Outstanding (in shares)	3,680	3,680
SOUTHWESTERN ELECTRIC POWER COMPANY | Subsidiaries
Restricted Cash	$ 7	$ 15
Securitized Assets	311	315
Long-term Debt Due Within One Year	17	17
Long-term Debt	296	304
SOUTHWESTERN ELECTRIC POWER COMPANY | Sabine
Materials and Supplies	1	1
Other Property, Plant and Equipment	101	125
Accumulated Depreciation and Amortization	$ 101	$ 125