STATEMENTS OF CASH FLOWS - PSO - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	$ 3,380	$ 3,290	$ 3,090
Deferred Income Taxes	311	58	185
Allowance for Equity Funds Used During Construction	(245)	(211)	(175)
Mark-to-Market of Risk Management Contracts	(116)	(81)	9
Deferred Fuel Over/Under-Recovery, Net	133	277	893
Change in Other Noncurrent Assets	(559)	(348)	(446)
Change in Other Noncurrent Liabilities	269	306	29
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(246)	(156)	236
Fuel, Materials and Supplies	115	172	(504)
Accounts Payable	252	85	(253)
Accrued Taxes, Net	32	240	22
Other Current Assets	85	(13)	(44)
Other Current Liabilities	103	182	(162)
Net Cash Flows from Operating Activities	6,944	6,804	5,012
INVESTING ACTIVITIES
Construction Expenditures	(8,453)	(7,631)	(7,378)
Acquisitions of Generation Facilities	(3,453)	(399)	(155)
Other Investing Activities	118	143	122
Net Cash Flows Used for Investing Activities	(11,939)	(7,596)	(6,267)
FINANCING ACTIVITIES
Issuance of Long-term Debt	8,261	5,117	5,463
Retirement of Long-term Debt	(3,649)	(2,685)	(2,196)
Principal Payments for Finance Lease Obligations	(51)	(65)	(68)
Dividends Paid on Common Stock	(2,008)	(1,898)	(1,752)
Other Financing Activities	(8)	(50)	(80)
Net Cash Flows from Financing Activities	5,017	659	1,077
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	22	(133)	(178)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	246	379	557
Cash, Cash Equivalents and Restricted Cash at End of Period	268	246	379
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	1,894	1,838	1,674
Noncash Acquisitions Under Finance Leases	44	30	49
Construction Expenditures Included in Current Liabilities as of December 31,	1,935	1,312	842
PUBLIC SERVICE COMPANY OF OKLAHOMA
OPERATING ACTIVITIES
Net Income	252	249	209
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	260	272	256
Deferred Income Taxes	150	21	8
Allowance for Equity Funds Used During Construction	(11)	(7)	(8)
Mark-to-Market of Risk Management Contracts	2	(27)	33
Deferred Fuel Over/Under-Recovery, Net	28	54	313
Change in Other Regulatory Assets	(54)	0	(108)
Change in Other Noncurrent Assets	4	(45)	(71)
Change in Other Noncurrent Liabilities	3	7	8
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(50)	32	(16)
Fuel, Materials and Supplies	8	15	(17)
Accounts Payable	68	18	(58)
Accrued Taxes, Net	31	(2)	(13)
Other Current Assets	2	(4)	10
Other Current Liabilities	52	(34)	45
Net Cash Flows from Operating Activities	745	549	591
INVESTING ACTIVITIES
Construction Expenditures	(824)	(598)	(562)
Change in Advances to Affiliates, Net	232	(232)	0
Acquisitions of Generation Facilities	(1,676)	0	(146)
Other Investing Activities	10	5	15
Net Cash Flows Used for Investing Activities	(2,258)	(825)	(693)
FINANCING ACTIVITIES
Capital Contribution from Parent	676	2	1
Return of Capital to Parent	0	0	(4)
Issuance of Long-term Debt	793	596	470
Change in Advances from Affiliates, Net	171	(54)	(310)
Retirement of Long-term Debt	(126)	(126)	(1)
Principal Payments for Finance Lease Obligations	(3)	(3)	(3)
Dividends Paid on Common Stock	0	(140)	(52)
Other Financing Activities	2	0	0
Net Cash Flows from Financing Activities	1,513	275	101
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	0	(1)	(1)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	2	3	4
Cash, Cash Equivalents and Restricted Cash at End of Period	2	2	3
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	106	102	87
Noncash Acquisitions Under Finance Leases	2	2	2
Construction Expenditures Included in Current Liabilities as of December 31,	$ 185	$ 88	$ 73