Income Taxes (Details) - USD ($)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020
Federal:
Current		$ 113,100,000	$ (27,800,000)		$ (138,200,000)
Deferred		(88,800,000)	182,600,000		146,900,000
Total Federal		24,300,000	154,800,000		8,700,000
Current		26,600,000	6,000,000.0		(16,700,000)
Deferred		(45,500,000)	(45,300,000)		48,500,000
Total State and Local		(18,900,000)	(39,300,000)		31,800,000
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		5,400,000	115,500,000		40,500,000
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		2,305,600,000	2,488,100,000		2,196,700,000
Less: Equity Earnings		109,400,000	(91,700,000)		(91,100,000)
Income Tax Expense/Benefit		5,400,000	115,500,000		40,500,000
Pretax Income		2,309,600,000	2,600,200,000		2,234,300,000
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 485,000,000.0	$ 546,000,000.0		$ 469,200,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
Depreciation		$ 17,100,000	$ 25,900,000		$ 26,500,000
Income Tax Reconciliation Nondeductible Expense Permanent Miscellaneous		11,500,000	(1,300,000)		(9,700,000)
Investment Tax Credit Amortization		(14,300,000)	(22,000,000.0)		(18,800,000)
Production Tax Credits		(197,100,000)	(98,800,000)		(83,100,000)
State and Local Income Taxes, Net		(14,000,000.0)	39,400,000		25,100,000
Removal Costs		(26,500,000)	(20,000,000.0)		(18,600,000)
AFUDC		(29,300,000)	(30,600,000)		(32,500,000)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments		0	(55,100,000)	[1]	0
Tax Reform Excess ADIT Reversal		(214,500,000)	(255,600,000)		(268,200,000)
Federal Return to Provision		(17,400,000)	(1,600,000)		(2,600,000)
CARES Act Provision		0	0		(48,000,000.0)
Other		4,900,000	(10,800,000)		1,200,000
Income Tax Expense/Benefit		$ 5,400,000	$ 115,500,000		$ 40,500,000
Effective Income Tax Rate		0.20%	4.40%		1.80%
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 3,402,500,000	$ 3,277,000,000
Deferred Tax Liabilities		(11,895,800,000)	(11,479,500,000)
Property Related Temporary Differences		(7,531,800,000)	(7,020,300,000)
Amounts Due from Customers for Future Federal Income Taxes		921,200,000	1,033,000,000
Deferred State Income Taxes		(949,900,000)	(1,116,700,000)
Securitized Assets		(98,900,000)	(128,800,000)
Regulatory Assets		(756,700,000)	(645,400,000)
Accrued Nuclear Decommissioning		(632,700,000)	(743,200,000)
Net Operating Loss Carryforward		120,700,000	285,700,000
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Tax Credit Carryforward		611,500,000	439,800,000
Operating Lease Liability		143,000,000.0	114,200,000
Investment in Partnership		(338,900,000)	(392,100,000)
All Other, Net		19,200,000	(28,700,000)
Net Deferred Tax Liabilities	[2]	(8,493,300,000)	(8,202,500,000)
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits
Balance at January 1,		14,300,000	13,200,000		$ 24,100,000
Increase - Tax Positions Taken During a Prior Period		5,100,000	1,200,000		600,000
Decrease - Tax Positions Taken During a Prior Period		0	(3,200,000)		(14,500,000)
Increase - Tax Positions Taken During the Current Year		3,800,000	3,100,000		3,000,000.0
Decrease - Settlements with Taxing Authorities		0	0		0
Decrease - Lapse of the Applicable Statute of Limitations		0	0		0
Balance at December 31,		23,200,000	14,300,000		13,200,000
Tax Contingency [Abstract]
Unrecognized Tax Benefits, if Recognized - Amount		23,000,000	14,000,000		12,000,000
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		5,400,000	115,500,000		40,500,000
Income Taxes Receivable			95,000,000
Income Tax Expense Re-Measurement			23,000,000
Operating Income (Loss)		(3,482,700,000)	(3,411,300,000)		(2,987,700,000)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		5,100,000	1,200,000		600,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		0	3,200,000		14,500,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions		3,800,000	3,100,000		3,000,000.0
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions		0	0		0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		0	0		0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		0	0		0
Unrecognized Tax Benefits		23,200,000	14,300,000		13,200,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability					48,000,000
Kentucky Power Co [Member]
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Net Deferred Tax Liabilities		(469.7)	(441.6)
Kentucky Transmission Company
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Net Deferred Tax Liabilities		$ (16.1)	(15.4)
Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
AEP Texas Inc. [Member]
Federal:
Current		$ 29,000,000.0	(1,200,000)		5,200,000
Deferred		41,400,000	40,500,000		(15,400,000)
Total Federal		70,400,000	39,300,000		(10,200,000)
Current		2,200,000	3,000,000.0		(100,000)
Deferred		0	800,000		(900,000)
Total State and Local		2,200,000	3,800,000		(1,000,000.0)
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		72,600,000	43,100,000		(11,200,000)
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		307,900,000	289,800,000		241,000,000.0
Income Tax Expense/Benefit		72,600,000	43,100,000		(11,200,000)
Pretax Income		380,500,000	332,900,000		229,800,000
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 79,900,000	$ 69,900,000		$ 48,300,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
State and Local Income Taxes, Net		$ 1,700,000	$ 2,400,000		$ (800,000)
AFUDC		(4,100,000)	(4,500,000)		(4,100,000)
Parent Company Loss Benefit		0	(3,200,000)		(4,500,000)
Tax Reform Excess ADIT Reversal		(5,500,000)	(21,300,000)		(47,900,000)
Other		600,000	(200,000)		(2,200,000)
Income Tax Expense/Benefit		$ 72,600,000	$ 43,100,000		$ (11,200,000)
Effective Income Tax Rate		19.10%	12.90%		(4.90%)
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 177,000,000.0	$ 173,800,000
Deferred Tax Liabilities		(1,321,200,000)	(1,262,700,000)
Property Related Temporary Differences		(1,130,700,000)	(1,060,200,000)
Amounts Due from Customers for Future Federal Income Taxes		111,000,000.0	110,000,000.0
Deferred State Income Taxes		(36,600,000)	(32,200,000)
Securitized Transition Assets		(65,000,000.0)	(84,400,000)
Regulatory Assets		(48,900,000)	(45,100,000)
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Operating Lease Liability		20,300,000	15,800,000
All Other, Net		5,700,000	7,200,000
Net Deferred Tax Liabilities		(1,144,200,000)	(1,088,900,000)
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		72,600,000	43,100,000		$ (11,200,000)
Operating Income (Loss)		$ (549,200,000)	(476,000,000.0)		(369,600,000)
AEP Texas Inc. [Member] | Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
AEP Texas Inc. [Member] | Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
AEP Transmission Co [Member]
Federal:
Current		$ 98,000,000.0	69,800,000		22,200,000
Deferred		46,000,000.0	54,100,000		65,400,000
Total Federal		144,000,000.0	123,900,000		87,600,000
Current		8,800,000	5,800,000		2,800,000
Deferred		16,300,000	14,400,000		16,300,000
Total State and Local		25,100,000	20,200,000		19,100,000
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		169,100,000	144,100,000		106,700,000
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		594,200,000	591,700,000		423,400,000
Income Tax Expense/Benefit		169,100,000	144,100,000		106,700,000
Pretax Income		763,300,000	735,800,000		530,100,000
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 160,300,000	$ 154,500,000		$ 111,300,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
State and Local Income Taxes, Net		$ 19,800,000	$ 19,800,000		$ 15,100,000
AFUDC		(14,800,000)	(14,100,000)		(15,500,000)
Parent Company Loss Benefit		0	(18,300,000)		(7,000,000.0)
Other		3,800,000	2,200,000		2,800,000
Income Tax Expense/Benefit		$ 169,100,000	$ 144,100,000		$ 106,700,000
Effective Income Tax Rate		22.20%	19.60%		20.10%
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 162,500,000	$ 158,800,000
Deferred Tax Liabilities		(1,202,900,000)	(1,121,700,000)
Property Related Temporary Differences		(1,065,500,000)	(997,000,000.0)
Amounts Due from Customers for Future Federal Income Taxes		116,600,000	118,200,000
Deferred State Income Taxes		(106,000,000.0)	(94,500,000)
Net Operating Loss Carryforward		5,500,000	8,100,000
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
All Other, Net		9,000,000.0	2,300,000
Net Deferred Tax Liabilities	[3]	(1,040,400,000)	(962,900,000)
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		169,100,000	144,100,000		$ 106,700,000
Operating Income (Loss)		$ (853,700,000)	(809,300,000)		(581,500,000)
AEP Transmission Co [Member] | Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
AEP Transmission Co [Member] | Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
Appalachian Power Co [Member]
Federal:
Current		$ (61,000,000.0)	5,000,000.0		21,400,000
Deferred		86,600,000	14,900,000		(27,100,000)
Total Federal		25,600,000	19,900,000		(5,700,000)
Current		(400,000)	2,200,000		9,300,000
Deferred		(7,000,000.0)	0		700,000
Total State and Local		(7,400,000)	2,200,000		10,000,000.0
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		18,200,000	22,100,000		4,300,000
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		394,200,000	348,900,000		369,700,000
Income Tax Expense/Benefit		18,200,000	22,100,000		4,300,000
Pretax Income		412,400,000	371,000,000.0		374,000,000.0
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 86,600,000	$ 77,900,000		$ 78,500,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
Depreciation		$ 4,700,000	$ 11,700,000		$ 12,700,000
State and Local Income Taxes, Net		(5,900,000)	2,100,000		7,900,000
Removal Costs		(9,800,000)	(7,300,000)		(5,700,000)
AFUDC		(3,700,000)	(4,600,000)		(4,500,000)
Parent Company Loss Benefit		0	0		(6,200,000)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments		0	4,500,000	[1]	0
Tax Reform Excess ADIT Reversal		(50,900,000)	(60,500,000)		(72,300,000)
Federal Return to Provision		(2,800,000)	(1,600,000)		(7,200,000)
Other		0	(100,000)		1,100,000
Income Tax Expense/Benefit		$ 18,200,000	$ 22,100,000		$ 4,300,000
Effective Income Tax Rate		4.40%	6.00%		1.10%
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 510,300,000	$ 495,100,000
Deferred Tax Liabilities		(2,502,500,000)	(2,299,800,000)
Property Related Temporary Differences		(1,509,800,000)	(1,476,500,000)
Amounts Due from Customers for Future Federal Income Taxes		163,000,000.0	182,100,000
Deferred State Income Taxes		(318,500,000)	(288,800,000)
Securitized Assets		(33,900,000)	(39,300,000)
Regulatory Assets		(301,200,000)	(177,000,000.0)
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Operating Lease Liability		15,600,000	14,200,000
All Other, Net		(7,400,000)	(19,400,000)
Net Deferred Tax Liabilities		(1,992,200,000)	(1,804,700,000)
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		18,200,000	22,100,000		$ 4,300,000
Operating Income (Loss)		$ (602,100,000)	(549,400,000)		(556,600,000)
Appalachian Power Co [Member] | Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
Appalachian Power Co [Member] | Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
Indiana Michigan Power Co [Member]
Federal:
Current		$ 43,400,000	26,900,000		11,300,000
Deferred		(51,300,000)	(35,500,000)		(20,600,000)
Total Federal		(7,900,000)	(8,600,000)		(9,300,000)
Current		10,900,000	(600,000)		1,900,000
Deferred		1,200,000	(1,400,000)		(100,000)
Total State and Local		12,100,000	(2,000,000.0)		1,800,000
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		4,200,000	(10,600,000)		(7,500,000)
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		324,700,000	279,800,000		284,800,000
Income Tax Expense/Benefit		4,200,000	(10,600,000)		(7,500,000)
Pretax Income		328,900,000	269,200,000		277,300,000
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 69,100,000	$ 56,500,000		$ 58,200,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
Depreciation		$ 2,900,000	$ 3,500,000		$ 1,600,000
Investment Tax Credit Amortization		(3,100,000)	(6,400,000)		(4,500,000)
State and Local Income Taxes, Net		9,600,000	(1,300,000)		1,500,000
Removal Costs		(12,400,000)	(9,700,000)		(10,500,000)
AFUDC		(2,100,000)	(2,700,000)		(2,400,000)
Parent Company Loss Benefit		0	(2,800,000)		(6,400,000)
Tax Reform Excess ADIT Reversal		(54,000,000.0)	(46,300,000)		(46,800,000)
Federal Return to Provision		(6,200,000)	(600,000)		1,800,000
Other		400,000	(800,000)		0
Income Tax Expense/Benefit		$ 4,200,000	$ (10,600,000)		$ (7,500,000)
Effective Income Tax Rate		1.30%	(3.90%)		(2.70%)
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 933,700,000	$ 1,072,200,000
Deferred Tax Liabilities		(2,090,700,000)	(2,172,400,000)
Property Related Temporary Differences		(398,000,000.0)	(286,200,000)
Amounts Due from Customers for Future Federal Income Taxes		114,300,000	135,500,000
Deferred State Income Taxes		(227,000,000.0)	(222,000,000.0)
Regulatory Assets		(29,500,000)	(23,600,000)
Accrued Nuclear Decommissioning		(632,700,000)	(743,200,000)
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Operating Lease Liability		13,600,000	13,500,000
All Other, Net		2,300,000	25,800,000
Net Deferred Tax Liabilities		(1,157,000,000)	(1,100,200,000)
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		4,200,000	(10,600,000)		$ (7,500,000)
Operating Income (Loss)		$ (419,900,000)	(357,900,000)		(362,900,000)
Indiana Michigan Power Co [Member] | Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
Indiana Michigan Power Co [Member] | Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
Ohio Power Co [Member]
Federal:
Current		$ (27,000,000.0)	6,800,000		(26,600,000)
Deferred		73,300,000	25,200,000		74,000,000.0
Total Federal		46,300,000	32,000,000.0		47,400,000
Current		(300,000)	(3,100,000)		(5,400,000)
Deferred		(1,800,000)	5,500,000		3,200,000
Total State and Local		(2,100,000)	2,400,000		(2,200,000)
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		44,200,000	34,400,000		45,200,000
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		287,800,000	253,600,000		271,400,000
Less: Equity Earnings		(600,000)	0		0
Income Tax Expense/Benefit		44,200,000	34,400,000		45,200,000
Pretax Income		331,400,000	288,000,000.0		316,600,000
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 69,600,000	$ 60,500,000		$ 66,500,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
Depreciation		$ 3,000,000.0	$ 2,200,000		$ 3,700,000
State and Local Income Taxes, Net		(1,600,000)	0		(1,700,000)
AFUDC		(2,900,000)	(2,300,000)		(2,600,000)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments		0	8,900,000	[1]	0
Tax Reform Excess ADIT Reversal		(27,500,000)	(32,600,000)		(27,200,000)
Federal Return to Provision		3,500,000	(1,200,000)		6,500,000
Other		100,000	(1,100,000)		0
Income Tax Expense/Benefit		$ 44,200,000	$ 34,400,000		$ 45,200,000
Effective Income Tax Rate		13.30%	11.90%		14.30%
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 218,800,000	$ 204,400,000
Deferred Tax Liabilities		(1,319,900,000)	(1,205,300,000)
Property Related Temporary Differences		(1,133,800,000)	(1,042,000,000)
Amounts Due from Customers for Future Federal Income Taxes		112,600,000	117,700,000
Deferred State Income Taxes		(59,600,000)	(58,800,000)
Regulatory Assets		(57,600,000)	(39,800,000)
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Operating Lease Liability		15,500,000	17,200,000
All Other, Net		21,800,000	4,800,000
Net Deferred Tax Liabilities		(1,101,100,000)	(1,000,900,000)
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits
Balance at January 1,		0	3,200,000		$ 8,400,000
Increase - Tax Positions Taken During a Prior Period		5,100,000	0		0
Decrease - Tax Positions Taken During a Prior Period		0	(3,200,000)		(5,200,000)
Increase - Tax Positions Taken During the Current Year		0	0		0
Decrease - Settlements with Taxing Authorities		0	0		0
Decrease - Lapse of the Applicable Statute of Limitations		0	0		0
Balance at December 31,		5,100,000	0		3,200,000
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		44,200,000	34,400,000		45,200,000
Operating Income (Loss)		(413,700,000)	(385,200,000)		(403,700,000)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		5,100,000	0		0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		0	3,200,000		5,200,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions		0	0		0
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions		0	0		0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		0	0		0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		0	0		0
Unrecognized Tax Benefits		$ 5,100,000	0		3,200,000
Ohio Power Co [Member] | Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
Ohio Power Co [Member] | Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
Public Service Co Of Oklahoma [Member]
Federal:
Current		$ (3,300,000)	(109,600,000)		(11,400,000)
Deferred		(50,500,000)	105,600,000		8,300,000
Total Federal		(53,800,000)	(4,000,000.0)		(3,100,000)
Current		0	0		100,000
Deferred		4,600,000	8,100,000		8,200,000
Total State and Local		4,600,000	8,100,000		8,300,000
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		(49,200,000)	4,100,000		5,200,000
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		167,600,000	141,100,000		123,000,000.0
Income Tax Expense/Benefit		(49,200,000)	4,100,000		5,200,000
Pretax Income		118,400,000	145,200,000		128,200,000
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 24,900,000	$ 30,500,000		$ 26,900,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
Investment Tax Credit Amortization		$ (1,600,000)	$ (1,800,000)		$ (2,100,000)
Production Tax Credits		(47,700,000)	(6,000,000.0)		0
State and Local Income Taxes, Net		4,300,000	6,400,000		6,500,000
Parent Company Loss Benefit		0	0		(200,000)
Tax Reform Excess ADIT Reversal		(25,400,000)	(25,400,000)		(25,500,000)
Federal Return to Provision		(3,700,000)	700,000		(500,000)
Other		0	(300,000)		100,000
Income Tax Expense/Benefit		$ (49,200,000)	$ 4,100,000		$ 5,200,000
Effective Income Tax Rate		(41.60%)	2.80%		4.10%
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 225,000,000.0	$ 170,000,000.0
Deferred Tax Liabilities		(1,013,600,000)	(952,300,000)
Property Related Temporary Differences		(763,300,000)	(708,600,000)
Amounts Due from Customers for Future Federal Income Taxes		96,000,000.0	111,500,000
Deferred State Income Taxes		(81,900,000)	(83,200,000)
Regulatory Assets		(140,200,000)	(228,000,000.0)
Net Operating Loss Carryforward		25,800,000	111,400,000
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Tax Credit Carryforward		54,300,000	6,600,000
All Other, Net		20,700,000	8,000,000.0
Net Deferred Tax Liabilities		(788,600,000)	(782,300,000)
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		(49,200,000)	4,100,000		$ 5,200,000
Operating Income (Loss)		$ (180,800,000)	(192,900,000)		(175,900,000)
Public Service Co Of Oklahoma [Member] | Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
Public Service Co Of Oklahoma [Member] | Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
Southwestern Electric Power Co [Member]
Federal:
Current		$ (32,300,000)	(16,700,000)		(13,600,000)
Deferred		13,400,000	26,200,000		19,600,000
Total Federal		(18,900,000)	9,500,000		6,000,000.0
Current		(1,800,000)	400,000		(8,200,000)
Deferred		(4,500,000)	(10,500,000)		11,600,000
Total State and Local		(6,300,000)	(10,100,000)		3,400,000
Income Tax Expense (Benefit):
Income Tax Expense/Benefit		(25,200,000)	(600,000)		9,400,000
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Net Income		294,300,000	242,100,000		183,700,000
Less: Equity Earnings		(1,400,000)	(3,400,000)		(2,900,000)
Income Tax Expense/Benefit		(25,200,000)	(600,000)		9,400,000
Pretax Income		267,700,000	238,100,000		190,200,000
Income Taxes on Pretax Income at Statutory Rate (21%)		$ 56,200,000	$ 50,000,000.0		$ 39,900,000
Federal Statutory Income Tax Rate		21.00%	21.00%		21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported
Depreciation		$ 2,300,000	$ 1,800,000		$ 1,900,000
Depletion		(4,000,000.0)	(2,700,000)		(3,400,000)
Production Tax Credits		(57,100,000)	(7,200,000)		0
State and Local Income Taxes, Net		(4,900,000)	(8,000,000.0)		2,700,000
Parent Company Loss Benefit		0	0		(5,600,000)
Tax Reform Excess ADIT Reversal		(14,800,000)	(31,100,000)		(21,900,000)
Other		(2,900,000)	(3,400,000)		(4,200,000)
Income Tax Expense/Benefit		$ (25,200,000)	$ (600,000)		$ 9,400,000
Effective Income Tax Rate		(9.40%)	(0.30%)		4.90%
Net Deferred Tax Liability and Significant Temporary Differences
Deferred Tax Assets		$ 374,900,000	$ 336,400,000
Deferred Tax Liabilities		(1,464,600,000)	(1,424,000,000)
Property Related Temporary Differences		(1,053,800,000)	(989,600,000)
Amounts Due from Customers for Future Federal Income Taxes		146,200,000	154,800,000
Deferred State Income Taxes		(208,700,000)	(234,900,000)
Regulatory Assets		(114,100,000)	(101,400,000)
Net Operating Loss Carryforward		42,700,000	67,400,000
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Tax Credit Carryforward		66,000,000.0	8,500,000
All Other, Net		32,000,000.0	7,600,000
Net Deferred Tax Liabilities		(1,089,700,000)	(1,087,600,000)
Income Taxes (Textuals) [Abstract]
Income Tax Expense/Benefit		(25,200,000)	(600,000)		$ 9,400,000
Operating Income (Loss)		$ (370,000,000.0)	(339,500,000)		(290,500,000)
Southwestern Electric Power Co [Member] | Minimum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2036
Southwestern Electric Power Co [Member] | Maximum [Member]
Income Taxes (Textuals) [Abstract]
Tax Credit Carryforward, Expiration Date		Dec. 31, 2041
Arkansas
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 224,400,000
Arkansas | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2023
Arkansas | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2032
Arkansas | Southwestern Electric Power Co [Member] | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2023
Arkansas | Southwestern Electric Power Co [Member] | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2032
Kentucky
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 231,300,000
Kentucky | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2030
Kentucky | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Louisiana
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 586,800,000
Louisiana | Southwestern Electric Power Co [Member]
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		577,200,000
Oklahoma
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 943,300,000
Oklahoma | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Oklahoma | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Oklahoma | AEP Transmission Co [Member]
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 33,000,000.0
Oklahoma | AEP Transmission Co [Member] | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Oklahoma | AEP Transmission Co [Member] | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Oklahoma | Public Service Co Of Oklahoma [Member]
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 899,600,000
Oklahoma | Public Service Co Of Oklahoma [Member] | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Oklahoma | Public Service Co Of Oklahoma [Member] | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Tennessee
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 77,700,000
Tennessee | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2030
Tennessee | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Virginia
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 11,200,000
Virginia | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2030
Virginia | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
West Virginia
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 12,300,000
West Virginia | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2029
West Virginia | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037
Ohio Municipal
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 1,257,700,000
Ohio Municipal | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2023
Ohio Municipal | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2027
Ohio Municipal | Ohio Power Co [Member]
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 190,100,000
Ohio Municipal | Ohio Power Co [Member] | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2024
Ohio Municipal | Ohio Power Co [Member] | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2027
Colorado
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 82,600,000
Pennsylvania | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2030
Pennsylvania | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2042
Illinois
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 52,400,000
Federal
Tax Credit Carryforward
Tax Credit Carryforward, Amount		612,000,000.0
Federal | AEP Texas Inc. [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		1,500,000
Federal | AEP Transmission Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		200,000
Federal | Appalachian Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		2,000,000.0
Federal | Indiana Michigan Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		11,400,000
Federal | Ohio Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		1,000,000.0
Federal | Public Service Co Of Oklahoma [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		54,300,000
Federal | Southwestern Electric Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		66,000,000.0
State and Local Jurisdiction
Tax Credit Carryforward
Tax Credit Carryforward, Amount		39,200,000
State and Local Jurisdiction | AEP Texas Inc. [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		0
State and Local Jurisdiction | AEP Transmission Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		0
State and Local Jurisdiction | Appalachian Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		0
State and Local Jurisdiction | Indiana Michigan Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		0
State and Local Jurisdiction | Ohio Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		0
State and Local Jurisdiction | Public Service Co Of Oklahoma [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		39,200,000
State and Local Jurisdiction | Southwestern Electric Power Co [Member]
Tax Credit Carryforward
Tax Credit Carryforward, Amount		0
MICHIGAN
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 58,700,000
MICHIGAN | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2029
MICHIGAN | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2031
NEW JERSEY
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 13,700,000
NEW JERSEY | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2036
NEW JERSEY | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2040
NEW MEXICO
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 22,900,000
PENNSYLVANIA
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 64,400,000
ILLINOIS | Minimum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2031
ILLINOIS | Maximum [Member]
Net Income Tax Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2041
Arkansas | Southwestern Electric Power Co [Member]
Net Income Tax Operating Loss Carryforwards
Net Income Tax Operating Loss Carryforward		$ 224,200,000
Dolet Hills Lignite Co, LLC [Member]
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Less: Equity Earnings		(1,400,000)	(3,400,000)		(2,900,000)
Dolet Hills Lignite Co, LLC [Member] | Southwestern Electric Power Co [Member]
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Less: Equity Earnings		(1,400,000)	(3,400,000)		(2,900,000)
Investment funds | Ohio Power Co [Member]
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported
Less: Equity Earnings		$ (600,000)	$ 0		$ 0

[1] 2021 amount represents an out of period adjustment related to Deferred Income Taxes and Income Tax Expense (Benefit). Management concluded the misstatement and subsequent correction was not material to the 2021 or prior period financial statements.

[2] 2022 and 2021 excludes Net Deferred Tax Liabilities of $469.7 million and $441.6 million, respectively, classified as Liabilities Held for Sale on the balance sheets.  See “Disposition of KPCo and KTCo” section of Note 7 for additional information.

[3] 2022 and 2021 excludes Net Deferred Tax Liabilities of $16.1 million and $15.4 million, respectively, classified as Liabilities Held for Sale on the balance sheets.  See “Disposition of KPCo and KTCo” section of Note 7 for additional information.