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STOCK COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of employees participating in stock-based compensation programs
At December 31, 2023, 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 employees1,401 191 210 42 40 193 
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 31202320222021
Expected volatility30.0%29.6%30.0%
Expected term (in years)
333
Interest rate3.8%1.7%0.2%
Weighted average grant-date fair value$76.83$79.69$69.06
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, 2023, 2022, and 2021 are as follows:
202320222021
(in millions)
Southern Company
Compensation cost recognized in income$107 $101 $112 
Tax benefit of compensation cost recognized in income28 26 29 
Southern Company Gas
Compensation cost recognized in income$14 $12 $17 
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, 2023, 2022, and 2021 are presented below for Southern Company and were immaterial for all other Registrants:
Year Ended December 31202320222021
(in millions)
Southern Company
Intrinsic value of options exercised$18 $49 $34 
Tax benefit of options exercised4 12 7 
Share-based compensation, stock options, activity
Southern Company's activity in the stock option program for 2023 is summarized below:
Shares Subject to OptionWeighted Average Exercise Price
(in millions)
Outstanding at December 31, 2022
1.0 $42.22 
Exercised0.7 42.54 
Outstanding and Exercisable at December 31, 2023
0.3 $41.58