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STOCK COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of employees participating in stock-based compensation programs
At December 31, 2022, the number of current and former employees participating in stock-based compensation programs for the Registrants was as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
Number of employees1,586 221 236 64 45 186 
Assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of TSR awards granted:
Year Ended December 31202220212020
Expected volatility29.6%30.0%15.4%
Expected term (in years)
333
Interest rate1.7%0.2%1.4%
Weighted average grant-date fair value$79.69$69.06$77.65
Schedule of compensation costs and related tax benefits
Total PSU compensation cost, and the related tax benefit recognized in income, for the years ended December 31, 2022, 2021, and 2020 are as follows:
202220212020
(in millions)
Southern Company
Compensation cost recognized in income$101 $112 $84 
Tax benefit of compensation cost recognized in income26 29 22 
Southern Company Gas
Compensation cost recognized in income$12 $17 $13 
Tax benefit of compensation cost recognized in income4 4 4 
Total intrinsic value of options exercised, and the related tax benefit, for the years ended December 31, 2022, 2021, and 2020 are presented below for Southern Company and Georgia Power and were immaterial for all other Registrants:
Year Ended December 31202220212020
(in millions)
Southern Company
Intrinsic value of options exercised$49 $34 $38 
Tax benefit of options exercised12 7 9 
Georgia Power
Intrinsic value of options exercised$15 $14 $9 
Tax benefit of options exercised4 3 2 
Share-based compensation, stock options, activity
Southern Company's activity in the stock option program for 2022 is summarized below:
Shares Subject to OptionWeighted Average Exercise Price
(in millions)
Outstanding at December 31, 2021
2.8 $42.95 
Exercised1.8 43.37 
Outstanding and Exercisable at December 31, 2022
1.0 $42.22