Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net Income (Loss)		$ 1,566.5	$ 1,527.1
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		1,695.5	1,485.9
Deferred Income Taxes		43.0	740.9
Carrying Costs Income		(7.2)	(14.2)
Allowance for Equity Funds Used During Construction		(92.4)	(62.2)
Mark-to-Market of Risk Management Contracts		(95.4)	(56.2)
Amortization of Nuclear Fuel		82.6	104.8
Pension Contributions to Qualified Plan Trust		0.0	(93.3)
Property Taxes		304.8	291.4
Deferred Fuel Over/Under-Recovery, Net		210.6	81.0
Gain on Sale of Merchant Generation Assets		0.0	(226.4)
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee		0.0	(12.4)
Recovery of Ohio Capacity Costs, Net		52.7	65.6
Provision for Refund - Global Settlement		(5.5)	(93.3)
Change in Other Noncurrent Assets		161.6	(334.6)
Change in Other Noncurrent Liabilities		141.9	205.7
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		(52.3)	201.3
Fuel, Materials and Supplies		98.7	58.5
Accounts Payable		(45.0)	(91.0)
Accrued Taxes, Net		(247.5)	(310.1)
Other Current Assets		11.7	(98.2)
Other Current Liabilities		101.1	(260.3)
Net Cash Flows from (Used for) Operating Activities		3,932.6	3,124.2
Investing Activities
Construction Expenditures		(4,688.4)	(3,778.2)
Purchases of Investment Securities		(1,591.2)	(1,855.8)
Sales of Investment Securities		1,550.9	1,808.6
Acquisitions of Nuclear Fuel		(26.1)	(73.2)
Proceeds From Sale Of Merchant Generation Assets		0.0	2,159.6
Other Investing Activities		66.1	16.3
Net Cash Flows from (Used for) Investing Activities		(4,688.7)	(1,722.7)
Financing Activities
Issuance of Common Stock, Net		62.5	0.0
Issuance of Long-term Debt		3,572.0	2,742.7
Commercial Paper and Credit Facility Borrowings		205.6	0.0
Change in Short-term Debt, Net		604.0	(653.7)
Retirement of Long-term Debt		(1,959.5)	(2,427.2)
Commercial Paper and Credit Facility Repayments		(205.6)	0.0
Make Whole Premium on Extinguishment of Long-term Debt		(10.3)	(46.1)
Principal Payments for Capital Lease Obligations		(49.4)	(50.5)
Dividends Paid on Common Stock		(922.5)	(875.0)
Other Financing Activities		(15.8)	(4.4)
Net Cash Flows from (Used for) Financing Activities		1,281.0	(1,314.2)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		524.9	87.3
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		412.6	403.5
Cash and Cash Equivalents at Beginning of Period		214.6
Cash, Cash Equivalents and Restricted Cash at End of Period		937.5	490.8
Cash and Cash Equivalents at End of Period		788.3
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		631.3	613.8
Net Cash Paid (Received) for Income Taxes		(27.9)	(6.8)
Noncash Acquisitions Under Capital Leases		43.5	44.5
Construction Expenditures Included in Current Liabilities as of September 30,		882.3	791.6
Construction Expenditures Included in Noncurrent Liabilities as of September 30,		0.0	71.8
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30,		12.1	0.6
Noncash Contribution of Assets by Noncontrolling Interest		84.0	0.0
Expected Reimbursement for Spent Nuclear Fuel Dry Cask Storage		2.1	2.8
AEP Texas Inc. [Member]
Operating Activities
Net Income (Loss)		151.1	146.6
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		364.9	343.0
Deferred Income Taxes		(21.2)	124.1
Allowance for Equity Funds Used During Construction		(15.2)	(2.2)
Mark-to-Market of Risk Management Contracts		0.0	0.1
Pension Contributions to Qualified Plan Trust		0.0	(8.8)
Property Taxes		(19.2)	(15.9)
Change in Regulatory Asset – Catastrophe Reserve		(22.3)	(72.3)
Change in Other Noncurrent Assets		(14.2)	(29.1)
Change in Other Noncurrent Liabilities		67.1	7.4
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		(26.5)	(47.6)
Fuel, Materials and Supplies		(2.4)	(0.1)
Accounts Payable		(19.1)	77.3
Accrued Taxes, Net		40.0	1.7
Other Current Assets		(6.3)	(2.5)
Other Current Liabilities		14.1	(31.2)
Net Cash Flows from (Used for) Operating Activities		490.8	490.5
Investing Activities
Construction Expenditures		(1,096.1)	(617.5)
Change in Advances to Affiliates, Net		103.9	(437.0)
Other Investing Activities		31.1	11.5
Net Cash Flows from (Used for) Investing Activities		(961.1)	(1,043.0)
Financing Activities
Capital Contributions from Parent		100.0	200.0
Issuance of Long-term Debt		494.0	749.9
Change in Advances from Affiliates, Net		77.8	(169.5)
Retirement of Long-term Debt		(231.7)	(248.4)
Principal Payments for Capital Lease Obligations		(3.6)	(3.0)
Other Financing Activities		0.9	(0.3)
Net Cash Flows from (Used for) Financing Activities		437.4	528.7
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(32.9)	(23.8)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		157.2	146.9
Cash and Cash Equivalents at Beginning of Period		2.0
Cash, Cash Equivalents and Restricted Cash at End of Period		124.3	123.1
Cash and Cash Equivalents at End of Period		0.1
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		92.2	101.1
Net Cash Paid (Received) for Income Taxes		(14.2)	(23.3)
Noncash Acquisitions Under Capital Leases		8.9	5.3
Construction Expenditures Included in Current Liabilities as of September 30,		176.4	166.1
AEP Transmission Co [Member]
Operating Activities
Net Income (Loss)	[1]	244.2	212.4
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		97.5	69.7
Deferred Income Taxes		76.3	191.9
Allowance for Equity Funds Used During Construction		(48.7)	(33.0)
Property Taxes		86.9	72.4
Long-term Accounts Receivable - Affiliated		(3.1)	(13.8)
Change in Other Noncurrent Assets		12.7	8.6
Change in Other Noncurrent Liabilities		18.0	25.7
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		23.5	(40.8)
Fuel, Materials and Supplies		(2.8)	(11.0)
Accounts Payable		3.3	20.4
Accrued Taxes, Net		(73.2)	(71.2)
Accrued Interest		20.9	18.4
Other Current Assets		(0.5)	(5.3)
Other Current Liabilities		(28.0)	0.5
Net Cash Flows from (Used for) Operating Activities		427.0	444.9
Investing Activities
Construction Expenditures		(1,171.8)	(1,050.7)
Change in Advances to Affiliates, Net		(131.7)	(223.8)
Acquisitions of Assets		(13.2)	(3.8)
Other Investing Activities		1.2	0.9
Net Cash Flows from (Used for) Investing Activities		(1,315.5)	(1,277.4)
Financing Activities
Capital Contributions from Parent		582.0	185.5
Issuance of Long-term Debt		321.1	618.3
Change in Advances from Affiliates, Net		(14.6)	28.7
Net Cash Flows from (Used for) Financing Activities		888.5	832.5
Net Increase (Decrease) in Cash and Cash Equivalents		0.0	0.0
Cash and Cash Equivalents at Beginning of Period		0.0	0.0
Cash and Cash Equivalents at End of Period		0.0	0.0
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		38.4	30.4
Net Cash Paid (Received) for Income Taxes		(32.1)	(93.4)
Construction Expenditures Included in Current Liabilities as of September 30,		237.0	248.9
Appalachian Power Co [Member]
Operating Activities
Net Income (Loss)		290.0	248.7
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		319.5	304.1
Deferred Income Taxes		(83.8)	121.7
Carrying Costs Income		(1.2)	(1.0)
Allowance for Equity Funds Used During Construction		(9.6)	(6.2)
Mark-to-Market of Risk Management Contracts		(43.7)	(28.3)
Pension Contributions to Qualified Plan Trust		0.0	(10.2)
Deferred Fuel Over/Under-Recovery, Net		12.8	4.9
Change in Other Noncurrent Assets		94.8	37.1
Change in Other Noncurrent Liabilities		3.8	7.9
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		39.4	39.9
Fuel, Materials and Supplies		53.0	14.0
Accounts Payable		(21.5)	6.2
Accrued Taxes, Net		(20.2)	(44.2)
Other Current Assets		(7.9)	(2.5)
Other Current Liabilities		64.1	9.1
Net Cash Flows from (Used for) Operating Activities		690.7	702.2
Investing Activities
Construction Expenditures		(575.8)	(560.0)
Change in Advances to Affiliates, Net		0.4	0.5
Other Investing Activities		10.0	11.8
Net Cash Flows from (Used for) Investing Activities		(565.4)	(547.7)
Financing Activities
Issuance of Long-term Debt		103.3	320.9
Change in Advances from Affiliates, Net		(87.5)	(10.1)
Retirement of Long-term Debt		(24.0)	(377.9)
Principal Payments for Capital Lease Obligations		(5.2)	(5.2)
Dividends Paid on Common Stock		(120.0)	(90.0)
Other Financing Activities		1.0	0.5
Net Cash Flows from (Used for) Financing Activities		(132.4)	(161.8)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(7.1)	(7.3)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		19.2	18.5
Cash and Cash Equivalents at Beginning of Period		2.9
Cash, Cash Equivalents and Restricted Cash at End of Period		12.1	11.2
Cash and Cash Equivalents at End of Period		2.2
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		104.5	107.1
Net Cash Paid (Received) for Income Taxes		26.7	24.4
Noncash Acquisitions Under Capital Leases		3.9	2.9
Construction Expenditures Included in Current Liabilities as of September 30,		87.6	107.2
Indiana Michigan Power Co [Member]
Operating Activities
Net Income (Loss)		231.6	143.8
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		207.1	154.8
Deferred Income Taxes		28.1	132.2
Deferral of Incremental Nuclear Refueling Outage Expenses, Net		13.5	15.5
Carrying Costs Income		(4.6)	(9.9)
Allowance for Equity Funds Used During Construction		(8.0)	(8.1)
Mark-to-Market of Risk Management Contracts		(0.3)	(7.5)
Amortization of Nuclear Fuel		82.6	104.8
Pension Contributions to Qualified Plan Trust		0.0	(13.0)
Deferred Fuel Over/Under-Recovery, Net		29.6	22.0
Change in Other Noncurrent Assets		(7.4)	(32.2)
Change in Other Noncurrent Liabilities		46.3	40.9
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		6.5	19.3
Fuel, Materials and Supplies		(1.1)	(4.1)
Accounts Payable		(34.7)	16.6
Customer Deposits		(0.7)	3.0
Accrued Taxes, Net		(7.1)	(30.2)
Accrued Interest		(15.3)	(17.4)
Other Current Assets		4.9	8.0
Other Current Liabilities		0.3	(14.2)
Net Cash Flows from (Used for) Operating Activities		571.3	524.3
Investing Activities
Construction Expenditures		(434.5)	(469.2)
Change in Advances to Affiliates, Net		(60.1)	(0.1)
Purchases of Investment Securities		(1,589.0)	(1,842.2)
Sales of Investment Securities		1,550.9	1,808.6
Acquisitions of Nuclear Fuel		(26.1)	(73.2)
Other Investing Activities		9.2	7.3
Net Cash Flows from (Used for) Investing Activities		(549.6)	(568.8)
Financing Activities
Issuance of Long-term Debt		1,168.1	411.1
Change in Advances from Affiliates, Net		(211.6)	(37.7)
Retirement of Long-term Debt		(856.1)	(227.1)
Principal Payments for Capital Lease Obligations		(7.3)	(8.7)
Dividends Paid on Common Stock		(105.5)	(93.7)
Other Financing Activities		(9.0)	0.7
Net Cash Flows from (Used for) Financing Activities		(21.4)	44.6
Net Increase (Decrease) in Cash and Cash Equivalents		0.3	0.1
Cash and Cash Equivalents at Beginning of Period		1.3	1.2
Cash and Cash Equivalents at End of Period		1.6	1.3
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		104.4	92.0
Net Cash Paid (Received) for Income Taxes		(26.5)	(69.6)
Noncash Acquisitions Under Capital Leases		4.4	5.9
Construction Expenditures Included in Current Liabilities as of September 30,		66.4	74.5
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30,		12.1	0.6
Expected Reimbursement for Spent Nuclear Fuel Dry Cask Storage		2.1	2.8
Ohio Power Co [Member]
Operating Activities
Net Income (Loss)		237.1	231.1
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		200.3	165.7
Amortization Of Generation Deferrals		171.9	172.9
Deferred Income Taxes		(71.9)	117.5
Carrying Costs Income		(1.5)	(3.0)
Allowance for Equity Funds Used During Construction		(7.8)	(4.1)
Mark-to-Market of Risk Management Contracts		(37.1)	19.5
Pension Contributions to Qualified Plan Trust		0.0	(8.2)
Property Taxes		191.1	175.9
Provision for Refund - Global Settlement		(5.5)	(93.3)
Change in Regulatory Assets		180.9	(82.2)
Change in Other Noncurrent Assets		0.8	(44.5)
Change in Other Noncurrent Liabilities		62.5	43.4
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		21.3	14.9
Fuel, Materials and Supplies		(3.7)	(7.1)
Accounts Payable		(31.8)	(31.2)
Accrued Taxes, Net		(210.6)	(284.3)
Other Current Assets		9.1	(17.3)
Other Current Liabilities		(4.3)	(34.8)
Net Cash Flows from (Used for) Operating Activities		700.8	330.9
Investing Activities
Construction Expenditures		(538.5)	(362.5)
Change in Advances to Affiliates, Net		0.0	24.2
Other Investing Activities		15.5	6.9
Net Cash Flows from (Used for) Investing Activities		(523.0)	(331.4)
Financing Activities
Issuance of Long-term Debt		392.8	0.0
Change in Advances from Affiliates, Net		155.1	167.6
Retirement of Long-term Debt		(397.0)	(46.4)
Principal Payments for Capital Lease Obligations		(2.9)	(3.1)
Dividends Paid on Common Stock		(337.5)	(130.0)
Other Financing Activities		0.7	0.8
Net Cash Flows from (Used for) Financing Activities		(188.8)	(11.1)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(11.0)	(11.6)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		29.7	30.3
Cash and Cash Equivalents at Beginning of Period		3.1
Cash, Cash Equivalents and Restricted Cash at End of Period		18.7	18.7
Cash and Cash Equivalents at End of Period		3.5
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		67.3	68.1
Net Cash Paid (Received) for Income Taxes		54.1	69.6
Noncash Acquisitions Under Capital Leases		3.0	3.6
Construction Expenditures Included in Current Liabilities as of September 30,		66.0	56.8
Public Service Co Of Oklahoma [Member]
Operating Activities
Net Income (Loss)		89.8	71.4
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		120.5	97.8
Deferred Income Taxes		(13.4)	93.7
Allowance for Equity Funds Used During Construction		0.3	(0.4)
Mark-to-Market of Risk Management Contracts		(11.5)	(3.9)
Pension Contributions to Qualified Plan Trust		0.0	(5.3)
Property Taxes		(9.6)	(9.4)
Deferred Fuel Over/Under-Recovery, Net		73.3	(5.6)
Provision for Refund		3.7	(39.4)
Change in Other Noncurrent Assets		6.9	(19.8)
Change in Other Noncurrent Liabilities		10.9	(1.4)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		(3.4)	5.8
Fuel, Materials and Supplies		(1.5)	13.5
Accounts Payable		6.9	(18.5)
Accrued Taxes, Net		38.4	20.1
Other Current Assets		0.3	(8.2)
Other Current Liabilities		15.1	1.5
Net Cash Flows from (Used for) Operating Activities		326.7	191.9
Investing Activities
Construction Expenditures		(162.8)	(203.1)
Other Investing Activities		3.9	1.5
Net Cash Flows from (Used for) Investing Activities		(158.9)	(201.6)
Financing Activities
Change in Advances from Affiliates, Net		(127.6)	66.0
Retirement of Long-term Debt		(0.3)	(0.3)
Principal Payments for Capital Lease Obligations		(2.5)	(3.2)
Dividends Paid on Common Stock		(37.5)	(52.5)
Other Financing Activities		0.4	0.3
Net Cash Flows from (Used for) Financing Activities		(167.5)	10.3
Net Increase (Decrease) in Cash and Cash Equivalents		0.3	0.6
Cash and Cash Equivalents at Beginning of Period		1.6	1.5
Cash and Cash Equivalents at End of Period		1.9	2.1
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		42.0	40.9
Net Cash Paid (Received) for Income Taxes		1.6	(46.6)
Noncash Acquisitions Under Capital Leases		2.3	1.0
Construction Expenditures Included in Current Liabilities as of September 30,		24.3	15.1
Southwestern Electric Power Co [Member]
Operating Activities
Net Income (Loss)		141.7	126.5
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities:
Depreciation and Amortization		175.9	158.1
Deferred Income Taxes		2.0	79.8
Allowance for Equity Funds Used During Construction		(3.8)	(1.2)
Mark-to-Market of Risk Management Contracts		2.5	(12.5)
Pension Contributions to Qualified Plan Trust		0.0	(8.9)
Property Taxes		(15.8)	(15.4)
Deferred Fuel Over/Under-Recovery, Net		4.4	2.4
Change in Other Noncurrent Assets		(8.9)	(2.9)
Change in Other Noncurrent Liabilities		52.1	(5.2)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net		44.3	12.1
Fuel, Materials and Supplies		5.0	13.6
Accounts Payable		(29.9)	(25.7)
Accrued Taxes, Net		38.4	69.1
Accrued Interest		(11.4)	(20.0)
Other Current Assets		3.2	0.7
Other Current Liabilities		15.6	(14.6)
Net Cash Flows from (Used for) Operating Activities		415.3	355.9
Investing Activities
Construction Expenditures		(336.6)	(265.3)
Change in Advances to Affiliates, Net		(516.6)	167.8
Other Investing Activities		1.2	3.1
Net Cash Flows from (Used for) Investing Activities		(852.0)	(94.4)
Financing Activities
Issuance of Long-term Debt		1,015.4	114.6
Change in Short-term Debt, Net		(2.6)	14.3
Change in Advances from Affiliates, Net		(118.7)	48.3
Retirement of Long-term Debt		(385.3)	(353.6)
Principal Payments for Capital Lease Obligations		(8.5)	(8.4)
Dividends Paid on Common Stock		(60.0)	(82.5)
Dividends Paid on Common Stock		(3.2)	(2.7)
Other Financing Activities		0.5	0.4
Net Cash Flows from (Used for) Financing Activities		437.6	(269.6)
Net Increase (Decrease) in Cash and Cash Equivalents		0.9	(8.1)
Cash and Cash Equivalents at Beginning of Period		1.6	10.3
Cash and Cash Equivalents at End of Period		2.5	2.2
Supplementary Information
Cash Paid for Interest, Net of Capitalized Amounts		102.5	109.4
Net Cash Paid (Received) for Income Taxes		12.9	(70.5)
Noncash Acquisitions Under Capital Leases		3.2	2.8
Construction Expenditures Included in Current Liabilities as of September 30,		$ 37.0	$ 40.7

[1] The amounts presented reflect the revisions made to AEPTCo’s previously issued financial statements. For additional details on revisions made to AEPTCo’s financial statements, see Note 1- Significant Accounting Matters.