Benefit Plans 1 (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Interest Crediting Rate		4.00%	4.25%
Rate of Compensation Increase	[1]	5.05%	5.05%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.50%
Interest Crediting Rate		4.25%	4.00%	4.00%
Expected Return on Plan Assets		7.50%	5.25%	4.75%
Rate of Compensation Increase	[2]	5.05%	5.05%	5.10%
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 4,072.7	$ 5,187.0
Service Cost		94.3	123.1	$ 129.2
Interest Cost		219.2	148.2	137.2
Actuarial (Gain) Loss		144.0	(983.4)
Benefit Payments		(368.6)	(402.2)
Benefit Obligation as of December 31		4,161.6	4,072.7	5,187.0
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		4,124.7	5,352.9
Actual Gain (Loss) on Plan Assets		353.8	(833.7)
Company Contributions		8.3	7.7
Benefit Payments		(368.6)	(402.2)
Fair Value of Plan Assets as of December 31		4,118.2	4,124.7	$ 5,352.9
Funded (Underfunded) Status as of December 31		(43.4)	52.0
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		17.3	113.4
Other Current Liabilities - Accrued Short-term Benefit Liability		(6.7)	(6.3)
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		(54.0)	(55.1)
Funded (Underfunded) Status		(43.4)	52.0
Components
Net Actuarial Loss		1,063.4	935.6
Prior Service Cost (Credit)		0.2	0.2
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		129.2	103.9
Amortization of Actuarial Gain (Loss)		(1.4)	(63.0)
Change for the Year		$ 127.8	$ 40.9
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase	[1]	5.05%	5.05%
Company Contributions		$ 8.3	$ 7.7
Pension Plans [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		938.6	841.8
Pension Plans [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		26.4	19.9
Pension Plans [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 98.6	$ 74.1
Pension Plans [Member] | AEP Texas Inc. [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Interest Crediting Rate		4.00%	4.25%
Rate of Compensation Increase	[1]	5.20%	5.15%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.50%
Interest Crediting Rate		4.25%	4.00%	4.00%
Expected Return on Plan Assets		7.50%	5.25%	4.75%
Rate of Compensation Increase	[2]	5.20%	5.15%	5.10%
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 334.1	$ 419.8
Service Cost		8.2	11.1	$ 11.8
Interest Cost		18.3	12.1	11.2
Actuarial (Gain) Loss		20.1	(67.8)
Benefit Payments		(37.6)	(41.1)
Benefit Obligation as of December 31		343.1	334.1	419.8
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		335.1	444.9
Actual Gain (Loss) on Plan Assets		34.8	(69.2)
Company Contributions		0.4	0.5
Benefit Payments		(37.6)	(41.1)
Fair Value of Plan Assets as of December 31		332.7	335.1	$ 444.9
Funded (Underfunded) Status as of December 31		(10.4)	1.0
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		0.1	3.7
Other Current Liabilities - Accrued Short-term Benefit Liability		(0.3)	(0.4)
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		10.2	2.3
Funded (Underfunded) Status		(10.4)	1.0
Components
Net Actuarial Loss		175.2	161.9
Prior Service Cost (Credit)		0.0	0.0
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		13.4	22.4
Amortization of Actuarial Gain (Loss)		(0.1)	(5.2)
Change for the Year		$ 13.3	$ 17.2
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase	[1]	5.20%	5.15%
Company Contributions		$ 0.4	$ 0.5
Pension Plans [Member] | AEP Texas Inc. [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		163.4	151.2
Pension Plans [Member] | AEP Texas Inc. [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		2.7	2.4
Pension Plans [Member] | AEP Texas Inc. [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 9.1	$ 8.3
Pension Plans [Member] | Appalachian Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Interest Crediting Rate		4.00%	4.25%
Rate of Compensation Increase	[1]	4.95%	4.90%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.50%
Interest Crediting Rate		4.25%	4.00%	4.00%
Expected Return on Plan Assets		7.50%	5.25%	4.75%
Rate of Compensation Increase	[2]	4.95%	4.90%	4.85%
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 485.7	$ 621.7
Service Cost		9.1	11.4	$ 11.9
Interest Cost		26.4	17.5	16.4
Actuarial (Gain) Loss		23.2	(123.1)
Benefit Payments		(40.3)	(41.8)
Benefit Obligation as of December 31		504.1	485.7	621.7
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		531.7	683.3
Actual Gain (Loss) on Plan Assets		58.4	(109.8)
Company Contributions		0.0	0.0
Benefit Payments		(40.3)	(41.8)
Fair Value of Plan Assets as of December 31		549.8	531.7	$ 683.3
Funded (Underfunded) Status as of December 31		45.7	46.0
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		46.0	46.6
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	0.0
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		(0.3)	(0.6)
Funded (Underfunded) Status		45.7	46.0
Components
Net Actuarial Loss		104.9	95.6
Prior Service Cost (Credit)		0.0	0.0
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		9.3	19.1
Amortization of Actuarial Gain (Loss)		0.0	(7.4)
Change for the Year		$ 9.3	$ 11.7
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase	[1]	4.95%	4.90%
Company Contributions		$ 0.0	$ 0.0
Pension Plans [Member] | Appalachian Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		102.6	93.6
Pension Plans [Member] | Appalachian Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		0.4	0.4
Pension Plans [Member] | Appalachian Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 1.9	$ 1.6
Pension Plans [Member] | Indiana Michigan Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Interest Crediting Rate		4.00%	4.25%
Rate of Compensation Increase	[1]	5.05%	5.00%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.50%
Interest Crediting Rate		4.25%	4.00%	4.00%
Expected Return on Plan Assets		7.50%	5.25%	4.75%
Rate of Compensation Increase	[2]	5.05%	5.00%	5.00%
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 466.8	$ 612.1
Service Cost		11.9	16.2	$ 17.5
Interest Cost		24.9	17.0	16.2
Actuarial (Gain) Loss		8.5	(138.0)
Benefit Payments		(35.1)	(40.5)
Benefit Obligation as of December 31		477.0	466.8	612.1
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		533.7	681.5
Actual Gain (Loss) on Plan Assets		51.5	(107.4)
Company Contributions		0.5	0.1
Benefit Payments		(35.1)	(40.5)
Fair Value of Plan Assets as of December 31		550.6	533.7	$ 681.5
Funded (Underfunded) Status as of December 31		73.6	66.9
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		74.8	68.5
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	(0.1)
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		1.2	1.5
Funded (Underfunded) Status		73.6	66.9
Components
Net Actuarial Loss		(5.8)	(6.9)
Prior Service Cost (Credit)		0.0	0.0
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		1.2	1.8
Amortization of Actuarial Gain (Loss)		(0.1)	(7.1)
Change for the Year		$ 1.1	$ (5.3)
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase	[1]	5.05%	5.00%
Company Contributions		$ 0.5	$ 0.1
Pension Plans [Member] | Indiana Michigan Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		6.4	4.8
Pension Plans [Member] | Indiana Michigan Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		(2.6)	(2.4)
Pension Plans [Member] | Indiana Michigan Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ (9.6)	$ (9.3)
Pension Plans [Member] | Ohio Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Interest Crediting Rate		4.00%	4.25%
Rate of Compensation Increase	[1]	5.45%	5.35%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.50%
Interest Crediting Rate		4.25%	4.00%	4.00%
Expected Return on Plan Assets		7.50%	5.25%	4.75%
Rate of Compensation Increase	[2]	5.45%	5.35%	5.30%
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 363.6	$ 470.7
Service Cost		8.4	11.2	$ 11.4
Interest Cost		19.8	13.3	12.5
Actuarial (Gain) Loss		17.5	(97.9)
Benefit Payments		(30.9)	(33.7)
Benefit Obligation as of December 31		378.4	363.6	470.7
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		406.4	524.8
Actual Gain (Loss) on Plan Assets		44.0	(84.8)
Company Contributions		0.0	0.1
Benefit Payments		(30.9)	(33.7)
Fair Value of Plan Assets as of December 31		419.5	406.4	$ 524.8
Funded (Underfunded) Status as of December 31		41.1	42.8
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		41.4	43.1
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	0.0
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		0.3	0.3
Funded (Underfunded) Status		41.1	42.8
Components
Net Actuarial Loss		131.9	124.3
Prior Service Cost (Credit)		0.0	0.0
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		7.6	11.7
Amortization of Actuarial Gain (Loss)		0.0	(5.5)
Change for the Year		$ 7.6	$ 6.2
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase	[1]	5.45%	5.35%
Company Contributions		$ 0.0	$ 0.1
Pension Plans [Member] | Ohio Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		131.9	124.3
Pension Plans [Member] | Ohio Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		0.0	0.0
Pension Plans [Member] | Ohio Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 0.0	$ 0.0
Pension Plans [Member] | Public Service Co Of Oklahoma [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Interest Crediting Rate		4.00%	4.25%
Rate of Compensation Increase	[1]	5.20%	5.15%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.50%
Interest Crediting Rate		4.25%	4.00%	4.00%
Expected Return on Plan Assets		7.50%	5.25%	4.75%
Rate of Compensation Increase	[2]	5.20%	5.15%	5.10%
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 192.3	$ 252.6
Service Cost		5.5	7.4	$ 8.0
Interest Cost		10.7	7.0	6.7
Actuarial (Gain) Loss		13.6	(52.9)
Benefit Payments		(19.9)	(21.8)
Benefit Obligation as of December 31		202.2	192.3	252.6
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		218.5	286.2
Actual Gain (Loss) on Plan Assets		24.0	(46.0)
Company Contributions		0.1	0.1
Benefit Payments		(19.9)	(21.8)
Fair Value of Plan Assets as of December 31		222.7	218.5	$ 286.2
Funded (Underfunded) Status as of December 31		20.5	26.2
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		21.8	27.6
Other Current Liabilities - Accrued Short-term Benefit Liability		(0.1)	(0.1)
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		1.2	1.3
Funded (Underfunded) Status		20.5	26.2
Components
Net Actuarial Loss		46.7	38.8
Prior Service Cost (Credit)		0.0	0.0
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		7.9	6.7
Amortization of Actuarial Gain (Loss)		0.0	(2.9)
Change for the Year		$ 7.9	$ 3.8
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase	[1]	5.20%	5.15%
Company Contributions		$ 0.1	$ 0.1
Pension Plans [Member] | Public Service Co Of Oklahoma [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		46.7	38.8
Pension Plans [Member] | Public Service Co Of Oklahoma [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		0.0	0.0
Pension Plans [Member] | Public Service Co Of Oklahoma [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 0.0	$ 0.0
Pension Plans [Member] | Southwestern Electric Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Interest Crediting Rate		4.00%	4.25%
Rate of Compensation Increase	[1]	5.00%	5.00%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.50%
Interest Crediting Rate		4.25%	4.00%	4.00%
Expected Return on Plan Assets		7.50%	5.25%	4.75%
Rate of Compensation Increase	[2]	5.00%	5.00%	4.95%
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 250.7	$ 317.7
Service Cost		7.7	10.6	$ 11.2
Interest Cost		13.9	9.1	8.5
Actuarial (Gain) Loss		16.8	(57.9)
Benefit Payments		(27.9)	(28.8)
Benefit Obligation as of December 31		261.2	250.7	317.7
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		231.3	308.3
Actual Gain (Loss) on Plan Assets		23.9	(48.3)
Company Contributions		0.2	0.1
Benefit Payments		(27.9)	(28.8)
Fair Value of Plan Assets as of December 31		227.5	231.3	$ 308.3
Funded (Underfunded) Status as of December 31		(33.7)	(19.4)
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		0.0	0.0
Other Current Liabilities - Accrued Short-term Benefit Liability		(0.1)	(0.1)
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		(33.6)	(19.3)
Funded (Underfunded) Status		(33.7)	(19.4)
Components
Net Actuarial Loss		89.6	77.6
Prior Service Cost (Credit)		0.0	0.0
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		12.1	5.0
Amortization of Actuarial Gain (Loss)		(0.1)	(3.8)
Change for the Year		$ 12.0	$ 1.2
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase	[1]	5.00%	5.00%
Company Contributions		$ 0.2	$ 0.1
Pension Plans [Member] | Southwestern Electric Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		89.7	77.6
Pension Plans [Member] | Southwestern Electric Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		0.0	0.0
Pension Plans [Member] | Southwestern Electric Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ (0.1)	0.0
Pension Plans [Member] | Minimum [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		3.00%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		3.00%
Pension Plans [Member] | Minimum [Member] | AEP Texas Inc. [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		3.00%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		3.00%
Pension Plans [Member] | Minimum [Member] | Appalachian Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		3.00%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		3.00%
Pension Plans [Member] | Minimum [Member] | Indiana Michigan Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		3.00%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		3.00%
Pension Plans [Member] | Minimum [Member] | Ohio Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		3.00%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		3.00%
Pension Plans [Member] | Minimum [Member] | Public Service Co Of Oklahoma [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		3.00%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		3.00%
Pension Plans [Member] | Minimum [Member] | Southwestern Electric Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		3.00%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		3.00%
Pension Plans [Member] | Maximum [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		11.50%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		11.50%
Pension Plans [Member] | Maximum [Member] | AEP Texas Inc. [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		11.50%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		11.50%
Pension Plans [Member] | Maximum [Member] | Appalachian Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		11.50%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		11.50%
Pension Plans [Member] | Maximum [Member] | Indiana Michigan Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		11.50%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		11.50%
Pension Plans [Member] | Maximum [Member] | Ohio Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		11.50%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		11.50%
Pension Plans [Member] | Maximum [Member] | Public Service Co Of Oklahoma [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		11.50%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		11.50%
Pension Plans [Member] | Maximum [Member] | Southwestern Electric Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Rate of Compensation Increase		11.50%
Benefit Plans (Textuals) [Abstract]
Rate of Compensation Increase		11.50%
Nonqualified Pension Plans [Member]
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 61.5
Benefit Obligation as of December 31		60.7	61.5
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		0.0
Company Contributions		8.0	8.0
Fair Value of Plan Assets as of December 31		0.0	0.0
Benefit Plans (Textuals) [Abstract]
Company Contributions		8.0	8.0
Nonqualified Pension Plans [Member] | AEP Texas Inc. [Member]
Change in Benefit Obligation
Benefit Obligation as of January 1		2.7
Benefit Obligation as of December 31			2.7
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		0.0
Fair Value of Plan Assets as of December 31		0.0	0.0
Nonqualified Pension Plans [Member] | Appalachian Power Co [Member]
Change in Benefit Obligation
Benefit Obligation as of January 1		0.6
Benefit Obligation as of December 31		0.4	0.6
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		0.0
Fair Value of Plan Assets as of December 31		0.0	0.0
Nonqualified Pension Plans [Member] | Indiana Michigan Power Co [Member]
Change in Benefit Obligation
Benefit Obligation as of January 1		1.6
Benefit Obligation as of December 31		1.2	1.6
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		0.0
Fair Value of Plan Assets as of December 31		0.0	0.0
Nonqualified Pension Plans [Member] | Ohio Power Co [Member]
Change in Benefit Obligation
Benefit Obligation as of January 1		0.3
Benefit Obligation as of December 31		0.3	0.3
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		0.0
Fair Value of Plan Assets as of December 31		0.0	0.0
Nonqualified Pension Plans [Member] | Public Service Co Of Oklahoma [Member]
Change in Benefit Obligation
Benefit Obligation as of January 1		1.5
Benefit Obligation as of December 31		1.4	1.5
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		0.0
Fair Value of Plan Assets as of December 31		0.0	0.0
Nonqualified Pension Plans [Member] | Southwestern Electric Power Co [Member]
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		231.3
Fair Value of Plan Assets as of December 31		$ 227.5	$ 231.3
Other Postretirement Benefit Plans [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.55%
Expected Return on Plan Assets		7.25%	5.50%	4.75%
Health Care Trend Rates
Initial		7.00%	7.50%
Ultimate		4.50%	4.50%
Year Ultimate Reached		2030	2029
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 872.6	$ 1,041.3
Service Cost		4.6	7.4	$ 9.5
Interest Cost		46.2	29.2	30.5
Actuarial (Gain) Loss		19.8	(109.8)
Benefit Payments		(137.8)	(140.1)
Participant Contributions		43.6	44.1
Medicare Subsidy		0.5	0.5
Benefit Obligation as of December 31		849.5	872.6	1,041.3
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		1,549.3	2,044.3
Actual Gain (Loss) on Plan Assets		213.2	(403.6)
Company Contributions		5.0	4.6
Participant Contributions		43.6	44.1
Benefit Payments		(137.8)	(140.1)
Fair Value of Plan Assets as of December 31		1,673.3	1,549.3	$ 2,044.3
Funded (Underfunded) Status as of December 31		823.8	676.7
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		838.0	699.5
Other Current Liabilities - Accrued Short-term Benefit Liability		(2.4)	(2.5)
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		(11.8)	(20.3)
Funded (Underfunded) Status		823.8	676.7
Components
Net Actuarial Loss		201.5	300.0
Prior Service Cost (Credit)		(27.4)	(90.5)
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		(83.7)	403.6
Amortization of Actuarial Gain (Loss)		(14.8)
Amortization of Prior Service Credit (Cost)		63.1	71.4
Change for the Year		(35.4)	475.0
Benefit Plans (Textuals) [Abstract]
Company Contributions		5.0	4.6
Other Postretirement Benefit Plans [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		106.1	126.0
Other Postretirement Benefit Plans [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		14.3	17.5
Other Postretirement Benefit Plans [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 53.7	$ 66.0
Other Postretirement Benefit Plans [Member] | AEP Texas Inc. [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.55%
Expected Return on Plan Assets		7.25%	5.50%	4.75%
Health Care Trend Rates
Initial		7.00%	7.50%
Ultimate		4.50%	4.50%
Year Ultimate Reached		2030	2029
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 68.6	$ 80.5
Service Cost		0.3	0.5	$ 0.7
Interest Cost		3.6	2.2	2.4
Actuarial (Gain) Loss		1.2	(7.1)
Benefit Payments		(10.7)	(10.9)
Participant Contributions		3.4	3.4
Medicare Subsidy		0.0	0.0
Benefit Obligation as of December 31		66.4	68.6	80.5
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		128.3	168.8
Actual Gain (Loss) on Plan Assets		16.5	(33.0)
Company Contributions		0.0	0.0
Participant Contributions		3.4	3.4
Benefit Payments		(10.7)	(10.9)
Fair Value of Plan Assets as of December 31		137.5	128.3	$ 168.8
Funded (Underfunded) Status as of December 31		71.1	59.7
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		71.1	59.7
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	0.0
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		0.0	0.0
Funded (Underfunded) Status		71.1	59.7
Components
Net Actuarial Loss		22.1	29.7
Prior Service Cost (Credit)		(2.3)	(7.6)
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		(6.4)	34.9
Amortization of Actuarial Gain (Loss)		(1.2)
Amortization of Prior Service Credit (Cost)		5.3	6.1
Change for the Year		(2.3)	41.0
Benefit Plans (Textuals) [Abstract]
Company Contributions		0.0	0.0
Other Postretirement Benefit Plans [Member] | AEP Texas Inc. [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		19.8	22.0
Other Postretirement Benefit Plans [Member] | AEP Texas Inc. [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		0.0	0.1
Other Postretirement Benefit Plans [Member] | AEP Texas Inc. [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 0.0	$ 0.0
Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.55%
Expected Return on Plan Assets		7.25%	5.50%	4.75%
Health Care Trend Rates
Initial		7.00%	7.50%
Ultimate		4.50%	4.50%
Year Ultimate Reached		2030	2029
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 140.7	$ 167.3
Service Cost		0.5	0.8	$ 1.0
Interest Cost		7.4	4.7	4.9
Actuarial (Gain) Loss		0.9	(16.2)
Benefit Payments		(21.6)	(23.0)
Participant Contributions		6.6	7.0
Medicare Subsidy		0.1	0.1
Benefit Obligation as of December 31		134.6	140.7	167.3
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		228.6	302.3
Actual Gain (Loss) on Plan Assets		28.1	(59.3)
Company Contributions		1.3	1.6
Participant Contributions		6.6	7.0
Benefit Payments		(21.6)	(23.0)
Fair Value of Plan Assets as of December 31		243.0	228.6	$ 302.3
Funded (Underfunded) Status as of December 31		108.4	87.9
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		125.6	106.3
Other Current Liabilities - Accrued Short-term Benefit Liability		(1.6)	(1.6)
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		(15.6)	(16.8)
Funded (Underfunded) Status		108.4	87.9
Components
Net Actuarial Loss		27.1	40.5
Prior Service Cost (Credit)		(4.2)	(13.4)
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		(11.1)	59.4
Amortization of Actuarial Gain (Loss)		(2.3)
Amortization of Prior Service Credit (Cost)		9.2	10.4
Change for the Year		(4.2)	69.8
Benefit Plans (Textuals) [Abstract]
Company Contributions		1.3	1.6
Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		13.2	14.7
Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		2.0	2.5
Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 7.7	$ 9.9
Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.55%
Expected Return on Plan Assets		7.25%	5.50%	4.75%
Health Care Trend Rates
Initial		7.00%	7.50%
Ultimate		4.50%	4.50%
Year Ultimate Reached		2030	2029
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 101.9	$ 118.6
Service Cost		0.6	0.9	$ 1.3
Interest Cost		5.4	3.4	3.5
Actuarial (Gain) Loss		3.2	(8.7)
Benefit Payments		(18.3)	(18.3)
Participant Contributions		6.0	6.0
Medicare Subsidy		0.0	0.0
Benefit Obligation as of December 31		98.8	101.9	118.6
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		190.5	248.7
Actual Gain (Loss) on Plan Assets		26.4	(45.9)
Company Contributions		0.0	0.0
Participant Contributions		6.0	6.0
Benefit Payments		(18.3)	(18.3)
Fair Value of Plan Assets as of December 31		204.6	190.5	$ 248.7
Funded (Underfunded) Status as of December 31		105.8	88.6
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		105.8	88.6
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	0.0
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		0.0	0.0
Funded (Underfunded) Status		105.8	88.6
Components
Net Actuarial Loss		28.7	40.2
Prior Service Cost (Credit)		(3.7)	(12.4)
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		(9.6)	50.9
Amortization of Actuarial Gain (Loss)		(1.9)
Amortization of Prior Service Credit (Cost)		8.7	9.7
Change for the Year		(2.8)	60.6
Benefit Plans (Textuals) [Abstract]
Company Contributions		0.0	0.0
Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		19.0	22.1
Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		1.3	1.2
Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 4.7	$ 4.5
Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.55%
Expected Return on Plan Assets		7.25%	5.50%	4.75%
Health Care Trend Rates
Initial		7.00%	7.50%
Ultimate		4.50%	4.50%
Year Ultimate Reached		2030	2029
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 88.9	$ 104.9
Service Cost		0.4	0.6	$ 0.8
Interest Cost		4.7	3.0	3.0
Actuarial (Gain) Loss		2.2	(8.9)
Benefit Payments		(15.0)	(15.5)
Participant Contributions		4.7	4.8
Medicare Subsidy		0.0	0.0
Benefit Obligation as of December 31		85.9	88.9	104.9
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		166.2	220.0
Actual Gain (Loss) on Plan Assets		21.9	(43.1)
Company Contributions		0.0	0.0
Participant Contributions		4.7	4.8
Benefit Payments		(15.0)	(15.5)
Fair Value of Plan Assets as of December 31		177.8	166.2	$ 220.0
Funded (Underfunded) Status as of December 31		91.9	77.3
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		91.9	77.3
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	0.0
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		0.0	0.0
Funded (Underfunded) Status		91.9	77.3
Components
Net Actuarial Loss		18.1	27.6
Prior Service Cost (Credit)		(2.9)	(9.2)
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		(7.9)	46.1
Amortization of Actuarial Gain (Loss)		(1.6)
Amortization of Prior Service Credit (Cost)		6.3	7.1
Change for the Year		(3.2)	53.2
Benefit Plans (Textuals) [Abstract]
Company Contributions		0.0	0.0
Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		15.2	18.4
Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		0.0	0.0
Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 0.0	$ 0.0
Other Postretirement Benefit Plans [Member] | Public Service Co Of Oklahoma [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.55%
Expected Return on Plan Assets		7.25%	5.50%	4.75%
Health Care Trend Rates
Initial		7.00%	7.50%
Ultimate		4.50%	4.50%
Year Ultimate Reached		2030	2029
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 45.7	$ 54.4
Service Cost		0.3	0.4	$ 0.6
Interest Cost		2.4	1.5	1.6
Actuarial (Gain) Loss		0.4	(5.2)
Benefit Payments		(7.6)	(7.9)
Participant Contributions		2.5	2.5
Medicare Subsidy		0.0	0.0
Benefit Obligation as of December 31		43.7	45.7	54.4
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		85.4	114.0
Actual Gain (Loss) on Plan Assets		9.9	(23.2)
Company Contributions		0.0	0.0
Participant Contributions		2.5	2.5
Benefit Payments		(7.6)	(7.9)
Fair Value of Plan Assets as of December 31		90.2	85.4	$ 114.0
Funded (Underfunded) Status as of December 31		46.5	39.7
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		46.5	39.7
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	0.0
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		0.0	0.0
Funded (Underfunded) Status		46.5	39.7
Components
Net Actuarial Loss		17.5	22.0
Prior Service Cost (Credit)		(1.6)	(5.6)
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		(3.7)	24.1
Amortization of Actuarial Gain (Loss)		(0.8)
Amortization of Prior Service Credit (Cost)		4.0	4.4
Change for the Year		(0.5)	28.5
Benefit Plans (Textuals) [Abstract]
Company Contributions		0.0	0.0
Other Postretirement Benefit Plans [Member] | Public Service Co Of Oklahoma [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		15.9	16.4
Other Postretirement Benefit Plans [Member] | Public Service Co Of Oklahoma [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		0.0	0.0
Other Postretirement Benefit Plans [Member] | Public Service Co Of Oklahoma [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 0.0	$ 0.0
Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member]
Actuarial Assumptions for Benefit Obligations
Discount Rate		5.15%	5.50%
Actuarial Assumptions for Net Periodic Benefit Costs
Discount Rate		5.50%	2.90%	2.55%
Expected Return on Plan Assets		7.25%	5.50%	4.75%
Health Care Trend Rates
Initial		7.00%	7.50%
Ultimate		4.50%	4.50%
Year Ultimate Reached		2030	2029
Change in Benefit Obligation
Benefit Obligation as of January 1		$ 55.1	$ 65.2
Service Cost		0.4	0.6	$ 0.8
Interest Cost		2.9	1.8	1.9
Actuarial (Gain) Loss		1.2	(6.6)
Benefit Payments		(8.8)	(8.8)
Participant Contributions		2.9	2.9
Medicare Subsidy		0.0	0.0
Benefit Obligation as of December 31		53.7	55.1	65.2
Change in Fair Value of Plan Assets
Fair Value of Plan Assets as of January 1		103.0	136.6
Actual Gain (Loss) on Plan Assets		14.0	(27.7)
Company Contributions		0.0	0.0
Participant Contributions		2.9	2.9
Benefit Payments		(8.8)	(8.8)
Fair Value of Plan Assets as of December 31		111.1	103.0	$ 136.6
Funded (Underfunded) Status as of December 31		57.4	47.9
Benefit Amounts Recognized on the Balance Sheets
Other Noncurrent Assets - Employee Benefits and Pension Assets		57.4	47.9
Other Current Liabilities - Accrued Short-term Benefit Liability		0.0	0.0
Other Noncurrent Liabilities - Employee Benefits and Pension Obligations		0.0	0.0
Funded (Underfunded) Status		57.4	47.9
Components
Net Actuarial Loss		18.4	25.0
Prior Service Cost (Credit)		(2.1)	(7.0)
Components of Change in Amounts Included in AOCI and Regulatory Assets
Actuarial (Gain) Loss During the Year		(5.6)	28.5
Amortization of Actuarial Gain (Loss)		(1.0)
Amortization of Prior Service Credit (Cost)		4.9	5.3
Change for the Year		(1.7)	33.8
Benefit Plans (Textuals) [Abstract]
Company Contributions		0.0	0.0
Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member] | Regulatory Assets [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		10.2	11.2
Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member] | Deferred Income Taxes [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		1.3	1.5
Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member] | Net of Tax AOCI [Member]
Recorded as
Total of Amounts Included in AOCI, Income Tax Expense and Regulatory Assets		$ 4.8	$ 5.3

[1] Rates are for base pay only.  In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees.

[2] Rates are for base pay only.  In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees.