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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock Based Compensation (Textuals) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 10,000,000 |  |
Number of Shares Remaining Available for Issuance Under the AEP Long-Term Incentive Plan |  | 5,249,391 |  |
Reduction in Aggregate Common Shares Authorized Per Share Issued Pursuant to Stock Options or Stock Appreciation Rights |  | 0.286 |  |
Performance Units and AEP Career Shares Reinvested Dividends Portion For [Member] |  |  |  |
Performance Units |  |  |  |
Awarded Units | [1] | 63,300 | 74,500 | 73,400
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |  |
Weighted Average Grant Date Fair Value |  | $ 98.73 | $ 84.48 | $ 84.87
Stock Based Compensation [Member] |  |  |  |
Compensation Cost and Actual Tax Benefit Realized for the Tax Deductions from Compensation Cost for Share-based Payment Arrangements |  |  |  |
Compensation Cost for Share-based Payment Arrangements | [2] | $ 63.3 | $ 61.1 | $ 53.8
Actual Tax Benefit Realized |  | 8.0 | 8.7 | 7.2
Total Compensation Cost Capitalized |  | 16.0 | $ 16.9 | $ 20.4
Stock Based Compensation (Textuals) |  |  |  |
Total Unrecognized Compensation Cost Related to Unvested Share-based Compensation Arrangements Granted |  | $ 78.0 |  |
Weighted-average Period of Unrecognized Compensation Costs (in years) |  | 1 year 4 months 28 days |  |
Stock Unit Accumulation Plan for Non Employee Directors [Member] |  |  |  |
Stock Based Compensation (Textuals) |  |  |  |
Number of Years After Termination of Board Service Participant Can Elect to Have Stock Units Paid in Cash |  | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |  |
Weighted Average Grant Date Fair Value |  | $ 95.16 | $ 84.54 | $ 83.80
Awarded Units |  | 14,500 | 12,600 | 12,100
Restricted Stock Units (RSUs) [Member] |  |  |  |
Total Fair Value and Total Intrinsic Value of Restricted Shares and Restricted Stock Units Vested |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  | $ 17.8 | $ 20.5 | $ 22.9
Intrinsic Value of Restricted Shares and Restricted Stock Units Vested | [3] | $ 20.3 | $ 22.0 | $ 25.2
Status of Nonvested Restricted Shares and Restricted Stock Units |  |  |  |
Nonvested, Shares/Units, Beginning Balance |  | 424,300 |  |
Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period |  | $ 84.86 |  |
Shares/Units, Vested |  | (209,000.0) |  |
Weighted Average Grant Date Fair Value, Vested |  | $ 85.15 |  |
Shares/Units, Forfeited |  | (46,100) |  |
Weighted Average Grant Date Fair Value, Shares/Units, Forfeited |  | $ 85.80 |  |
Nonvested, Shares/Units, Ending Balance |  | 459,600 | 424,300 |
Nonvested, Weighted Average Grant Date Fair Value, End of Period |  | $ 88.05 | $ 84.86 |
Stock Based Compensation (Textuals) |  |  |  |
Maximum Contractual Term of Outstanding Restricted Stock Units (in months) |  | 40 months |  |
Total Aggregate Intrinsic Value of Nonvested Shares |  | $ 44.0 |  |
Weighted Average Remaining Contractual Life of Nonvested Shares (in years) |  | 1 year 9 months 18 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |  |
Weighted Average Grant Date Fair Value |  | $ 90.48 | $ 80.39 | $ 94.38
Awarded Units |  | 290,400 | 280,000.0 | 268,700
Performance Units [Member] |  |  |  |
Performance Units |  |  |  |
Awarded Units |  | 530,300 | 565,000.0 | 424,800
Vesting Period (in years) |  | 3 years | 3 years | 3 years
Certified Performance Scores and Units Earned |  |  |  |
Certified Performance Score |  | 131.10% | 102.90% | 128.20%
Performance Units Earned |  | 512,660 | 537,166 | 757,858
Performance Units Manditorily Deferred as AEP Career Shares |  | 28,282 | 14,613 | 13,614
Performance Units Voluntarily Deferred into the Incentive Compensation Deferral Program |  | 23,609 | 22,915 | 26,936
Share Based Compensation Performance Units to be Settled in Shares | [4] | 460,769 | 499,638 | 717,308
Cash Payouts |  |  |  |
Equity Payouts for Performance Units |  | $ 43.2 | $ 54.7 | $ 75.4
Stock Based Compensation (Textuals) |  |  |  |
Performance Score by HR Committee, Lower Range |  | 0.00% |  |
Performance Score by HR Committee, Higher Range |  | 200.00% |  |
Equity Payouts For Career Share Distributions |  | $ 5.1 | $ 4.0 | $ 1.9
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | [5] | 2 years 10 months 9 days | 2 years 10 months 17 days | 2 years 10 months 13 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  | 25.92% | 25.87% | 13.67%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum |  | 40.82% | 39.90% | 28.15%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  | 1.64% | 0.19% | 1.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | [6] | 0.00% | 0.00% | 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate |  | 31.09% | 31.01% | 16.39%
Weighted Average Grant Date Fair Value |  | $ 97.61 | $ 81.02 | $ 116.56
Performance Units and Reinvested Dividends [Member] |  |  |  |
Share Based Compensation Performance Units Converted to Shares | [7] | 461,000 |  |
Performance Units |  |  |  |
Awarded Units |  | 45,500 |  |
Status of Nonvested Restricted Shares and Restricted Stock Units |  |  |  |
Nonvested, Shares/Units, Beginning Balance |  | 923,800 |  |
Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period |  | $ 96.15 |  |
Shares/Units, Vested | [7] | (395,800) |  |
Weighted Average Grant Date Fair Value, Vested |  | $ 116.06 |  |
Shares/Units, Forfeited |  | (91,600) |  |
Weighted Average Grant Date Fair Value, Shares/Units, Forfeited |  | $ 84.81 |  |
Nonvested, Shares/Units, Ending Balance |  | 1,012,200 | 923,800 |
Nonvested, Weighted Average Grant Date Fair Value, End of Period |  | $ 90.27 | $ 96.15 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |  |
Weighted Average Grant Date Fair Value |  | $ 98.73 |  |
[1] | The vesting period for the reinvested dividends on performance shares is equal to the remaining life of the related performance shares. Dividends on AEP career shares vest immediately when the dividend is awarded but are not settled in AEP common stock until after the participant’s AEP employment ends.
[2] | Compensation cost for share-based payment arrangements is included in Other Operation and Maintenance expenses on the statements of income.
[3] | Intrinsic value is calculated as market price at the vesting date.
[4] | Performance shares settled in AEP common stock in the quarter following the end of the year shown.
[5] | Period from award date to vesting date.
[6] | Equivalent to reinvesting dividends.
[7] | The vested Performance Shares will be converted to 461 thousand shares based on the closing share price on the day before settlement.

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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Rate of weighted-average expected volatility for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References No definition available. + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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