CONSOLIDATED STATEMENTS OF CASH FLOWS - OPCo - 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
Asset Impairments and Other Related Charges	66	143	86
Allowance for Equity Funds Used During Construction	(245)	(211)	(175)
Mark-to-Market of Risk Management Contracts	(116)	(81)	9
Property Taxes	(42)	(45)	(41)
Change in Regulatory Assets	(304)	(174)	(316)
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
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)
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
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
OHIO POWER COMPANY
OPERATING ACTIVITIES
Net Income	328	306	328
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	380	386	316
Deferred Income Taxes	47	8	8
Asset Impairments and Other Related Charges	18	53	0
Allowance for Equity Funds Used During Construction	(25)	(23)	(17)
Mark-to-Market of Risk Management Contracts	(14)	(3)	11
Property Taxes	(22)	(25)	(12)
Change in Regulatory Assets	30	45	(91)
Change in Other Noncurrent Assets	(32)	(38)	(138)
Change in Other Noncurrent Liabilities	41	58	0
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	77	(170)	73
Materials and Supplies	(32)	55	(7)
Accounts Payable	57	6	24
Accrued Taxes, Net	11	76	28
Other Current Assets	5	(7)	0
Other Current Liabilities	(1)	43	(61)
Net Cash Flows from Operating Activities	868	770	462
INVESTING ACTIVITIES
Construction Expenditures	(1,058)	(930)	(990)
Change in Advances to Affiliates, Net	115	(115)	0
Other Investing Activities	60	34	41
Net Cash Flows Used for Investing Activities	(883)	(1,011)	(949)
FINANCING ACTIVITIES
Capital Contribution from Parent	10	7	175
Issuance of Long-term Debt	0	346	395
Change in Advances from Affiliates, Net	79	(111)	(62)
Principal Payments for Finance Lease Obligations	(4)	(5)	(5)
Dividends Paid on Common Stock	(71)	0	(20)
Other Financing Activities	1	2	1
Net Cash Flows from Financing Activities	15	239	484
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	0	(2)	(3)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	5	7	10
Cash, Cash Equivalents and Restricted Cash at End of Period	5	5	7
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	147	139	124
Noncash Acquisitions Under Finance Leases	2	2	4
Construction Expenditures Included in Current Liabilities as of December 31,	$ 145	$ 158	$ 98