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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance Units and Reinvested Dividends on Outstanding Performance Units
Years Ended December 31,
Performance Shares202120202019
Awarded Shares (in thousands)565.0 424.8 535.0 
Weighted-Average Share Fair Value at Grant Date$81.02 $116.56 $83.21 
Vesting Period (in years)333
Performance Shares and AEP Career Shares
(Reinvested Dividends Portion)		Years Ended December 31,
202120202019
Awarded Shares (in thousands)74.5 73.4 66.4 
Weighted-Average Fair Value at Grant Date$84.48 $84.87 $88.73 
Vesting Period (in years)(a)(a)(a)
(a)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.
Summary of Performance Scores and Performance Units Earned
Years Ended December 31,
Performance Shares202120202019
Certified Performance Score102.9 %128.2 %132.7 %
Performance Shares Earned537,166 757,858 792,897 
Performance Shares Mandatorily Deferred as AEP Career Shares14,613 13,614 10,063 
Performance Shares Voluntarily Deferred into the Incentive Compensation Deferral Program
22,915 26,936 49,392 
Performance Shares to be Settled (a)499,638 717,308 733,442 

(a)Performance shares settled in AEP common stock in the quarter following the end of the year shown.
Summary of Cash Payouts for Performance Units and Career Shares
Years Ended December 31,
Performance Shares and AEP Career Shares202120202019
(in millions)
Cash Settlements for Performance Units$— $— $58.3 
AEP Common Stock Settlements for Performance Shares54.7 75.4 — 
AEP Common Stock Settlements for Career Share Distributions4.0 1.9 6.6 
Status of Nonvested Performance Units
Nonvested Performance SharesSharesWeighted
Average
Grant Date
Fair Value
(in thousands)
Nonvested as of January 1, 2021938.6 $98.05 
Awarded565.0 81.02 
Dividends53.4 84.45 
Vested (a)(529.0)83.87 
Forfeited(104.2)87.65 
Nonvested as of December 31, 2021923.8 96.15 

(a)The vested Performance Shares will be converted to 500 thousand shares based on the closing share price on the day before settlement.
Monte Carlo Valuation Assumptions
Years Ended December 31,
Assumptions202120202019
Valuation Period (in years) (a)2.882.872.87
Expected Volatility Minimum25.87 %13.67 %14.83 %
Expected Volatility Maximum39.90 %28.15 %25.57 %
Expected Volatility Average31.01 %16.39 %17.39 %
Dividend Rate (b)— %— %— %
Risk Free Rate0.19 %1.40 %2.49 %

(a)Period from award date to vesting date.
(b)Equivalent to reinvesting dividends.
Summary of Units Awarded and Fair Value of Restricted Stock Units
Years Ended December 31,
Restricted Stock Units202120202019
Awarded Units (in thousands)280.0 268.7 304.8 
Weighted-Average Grant Date Fair Value$80.39 $94.38 $81.57 
Total Fair Value and Total Intrinsic Value of Restricted Shares and Restricted Stock Units Vested
Years Ended December 31,
Restricted Stock Units202120202019
(in millions)
Fair Value of Restricted Stock Units Vested$20.5 $22.9 $16.3 
Intrinsic Value of Restricted Stock Units Vested (a)22.0 25.2 21.6 

(a)Intrinsic value is calculated as market price at the vesting date.
Status of Nonvested Restricted Shares and Restricted Stock Units
Nonvested Restricted Stock UnitsShares/UnitsWeighted
Average
Grant Date
Fair Value
(in thousands)
Nonvested as of January 1, 2021448.0 $86.56 
Awarded280.0 80.39 
Vested(250.5)81.92 
Forfeited(53.2)85.80 
Nonvested as of December 31, 2021424.3 84.86 
Stock Unit Accumulation Plan for Non-employee Directors
Years Ended December 31,
Stock Unit Accumulation Plan for Non-Employee Directors202120202019
Awarded Units (in thousands)12.6 12.1 10.0 
Weighted-Average Grant Date Fair Value$84.54 $83.80 $89.13 
Compensation Cost and Actual Tax Benefit Realized for Tax Deductions from Compensation Cost for Share-based Payment Arrangements
Years Ended December 31,
Share-based Compensation Plans202120202019
(in millions)
Compensation Cost for Share-based Payment Arrangements (a)$61.1 $53.8 $57.9 
Actual Tax Benefit8.7 7.2 8.4 
Total Compensation Cost Capitalized16.9 20.4 20.0 

(a)Compensation cost for share-based payment arrangements is included in Other Operation and Maintenance expenses on the statements of income.