CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - APCo - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	$ 833.4	$ 787.1
Deferred Income Taxes	165.2	(113.3)
Allowance for Equity Funds Used During Construction	(57.3)	(43.6)
Mark-to-Market of Risk Management Contracts	(14.8)	40.9
Deferred Fuel Over/Under-Recovery, Net	(74.5)	43.4
Change in Other Noncurrent Assets	(130.9)	(74.5)
Change in Other Noncurrent Liabilities	141.5	61.8
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(1.5)	34.9
Fuel, Materials and Supplies	138.6	104.3
Accounts Payable	6.2	(99.5)
Accrued Taxes, Net	(153.4)	(57.7)
Other Current Assets	(23.6)	(91.3)
Other Current Liabilities	(92.7)	(66.8)
Net Cash Flows from Operating Activities	1,450.0	1,442.2
INVESTING ACTIVITIES
Construction Expenditures	(2,100.2)	(1,761.7)
Other Investing Activities	50.2	29.6
Net Cash Flows Used for Investing Activities	(2,102.0)	(1,669.3)
FINANCING ACTIVITIES
Issuance of Long-term Debt	561.6	859.9
Retirement of Long-term Debt	(229.1)	(1,162.2)
Principal Payments for Finance Lease Obligations	(12.5)	(17.0)
Dividends Paid on Common Stock	(501.0)	(466.9)
Other Financing Activities	(18.7)	(31.9)
Net Cash Flows from Financing Activities	698.0	129.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	46.0	(97.2)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	246.0	379.0
Cash, Cash Equivalents and Restricted Cash at End of Period	292.0	281.8
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	350.2	368.3
Noncash Acquisitions Under Finance Leases	7.9	7.0
Construction Expenditures Included in Current Liabilities as of March 31,	1,040.9	837.0
APCo
OPERATING ACTIVITIES
Net Income (Loss)	164.6	136.5
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	163.0	149.8
Deferred Income Taxes	19.9	(12.8)
Allowance for Equity Funds Used During Construction	(4.4)	(2.9)
Mark-to-Market of Risk Management Contracts	6.4	11.8
Deferred Fuel Over/Under-Recovery, Net	2.2	62.4
Change in Regulatory Assets	(85.6)	19.1
Change in Other Noncurrent Assets	(24.2)	(15.2)
Change in Other Noncurrent Liabilities	37.7	6.5
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	29.2	(10.6)
Fuel, Materials and Supplies	43.0	30.0
Margin Deposits	1.5	11.0
Accounts Payable	(29.0)	(24.7)
Accrued Taxes, Net	24.3	33.0
Other Current Assets	(5.7)	0.0
Other Current Liabilities	10.0	12.4
Net Cash Flows from Operating Activities	352.9	406.3
INVESTING ACTIVITIES
Construction Expenditures	(261.5)	(236.0)
Change in Advances to Affiliates, Net	(0.5)	(18.5)
Other Investing Activities	1.4	3.6
Net Cash Flows Used for Investing Activities	(260.6)	(250.9)
FINANCING ACTIVITIES
Capital Contribution from Parent	0.0	100.0
Issuance of Long-term Debt	0.0	395.8
Change in Advances from Affiliates, Net	(28.3)	(339.6)
Retirement of Long-term Debt	(14.0)	(313.4)
Principal Payments for Finance Lease Obligations	(2.1)	(2.2)
Dividends Paid on Common Stock	(50.0)	0.0
Other Financing Activities	1.3	0.1
Net Cash Flows from Financing Activities	(93.1)	(159.3)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(0.8)	(3.9)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	20.1	19.9
Cash, Cash Equivalents and Restricted Cash at End of Period	19.3	16.0
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	35.3	41.5
Noncash Acquisitions Under Finance Leases	1.6	0.3
Construction Expenditures Included in Current Liabilities as of March 31,	$ 139.3	$ 107.3