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Pay vs Performance Disclosure
 5 Months Ended 7 Months Ended 12 Months Ended
May 24, 2023
Dec. 31, 2023
Dec. 31, 2024
USD ($)
percentile
Dec. 31, 2023
USD ($)
percentile
Dec. 31, 2022
USD ($)
percentile
Dec. 31, 2021
USD ($)
percentile
Dec. 31, 2020
USD ($)
percentile
Pay vs Performance Disclosure              
Pay vs Performance Disclosure, Table    
PEO PayNon-PEO PayValue of Initial Fixed
$100 Investment
Based On		Percentile
Fiscal
Year
(a)
Summary
Compensation
Table Total for CEO
($)
(b)
Compensation
Actually Paid to CEO
($)
(c)
Average
Summary
Compensation
Table Total for
non-CEO NEOs
($)
(d)
Average
Compensation
Actually Paid to
non-CEO NEOs
($)
(e)
Southern
Total
Shareholder
Return
($)
(f)
Peer Group
Total
Shareholder
Return
($)
(g)
Net Income
($ millions)
(h)
Company
Selected
Measure
One-Year
Relative TSR
(percentile)
(i)
WomackFanningWomackFanning
202423,885,173 — 28,200,592 — 5,207,018 7,724,411 157.57 122.12 4,401 68th
2023 23,521,052 33,469,800 18,378,941 40,567,478 5,555,346 6,433,480 129.49 101.02 3,976 86th
202224,006,670 42,131,615 5,668,554 6,722,302 126.71 111.24 3,524 77th
202121,243,559 35,516,807 5,210,958 7,015,374 117.07 113.92 2,393 45th
202022,366,850 23,821,625 7,160,434 6,386,601 100.63 99.38 3,119 70th
        
Named Executive Officers, Footnote    
2024: CEO - Christopher C. Womack; Other NEOs - Daniel S. Tucker, Stanley W. Connally, Jr., Kimberly S. Greene and James Y. Kerr
2023: CEO - Thomas A. Fanning: January 1 to May 24, Christopher C. Womack: May 24 to December 31; Other NEOs - Daniel S. Tucker, Kimberly S. Greene, James Y. Kerr and Stephen E. Kuczynski
2022: CEO - Thomas A. Fanning; Other NEOs - Daniel S. Tucker, Christopher C. Womack, Stephen E. Kuczynski and Mark A. Crosswhite
2021: CEO - Thomas A. Fanning; Other NEOs - Daniel S. Tucker, Mark. A. Crosswhite, Stephen E. Kuczynski, Christopher C. Womack, Andrew W. Evans and W. Paul Bowers
2020: CEO - Thomas A. Fanning; Other NEOs - Andrew W. Evans, W. Paul Bowers, Mark A. Crosswhite and Stephen E. Kuczynski
        
Peer Group Issuers, Footnote    
The peer group utilized in the table above is the Philadelphia Utilities Sector Index (UTY). For each Covered Year, the peer group cumulative TSR was calculated based on a deemed fixed investment of $100 in the index through each Measurement Period, assuming dividend reinvestment.
        
PEO Total Compensation Amount     $ 23,885,173        
PEO Actually Paid Compensation Amount     $ 28,200,592        
Adjustment To PEO Compensation, Footnote    
To calculate Compensation Actually Paid (CAP) to the CEO for 2024, the following amounts were deducted from and added to the “Total” compensation amount for the CEO reflected in each year’s Summary Compensation Table (SCT):
2024 Fiscal Year
Summary
Compensation
Total
($)		Minus: SCT
“Stock Awards”
($)		Minus: SCT “Change in
Pension Value and
Nonqualified Deferred
Compensation”
($)		Add: Stock
Award
Fair Value
($)		Add: Pension
Service Costs
($)
Compensation
Actually Paid
($)
PEO
23,885,173 11,725,994 7,142,735 22,427,771 756,377 28,200,592 
Average
Non-PEO NEOs		5,207,018 2,436,842 515,338 5,096,980 372,593 7,724,411 
The deductions of “Stock Awards” and “Change in Pension Value and Nonqualified Deferred Compensation” are found in columns (d) and (f) of the SCT for each covered year.
Stock Award Fair Value The addition of Stock Award Fair Value reflects:
PEO
Average
Non-PEO NEOs
Fair Value of Awards Granted during Year that remain unvested as of Year-End$18,037,633 $3,667,445 
Fair Value of Awards Granted during Year that vested during such Year— — 
Change in Fair Value from prior December 31 to December 31 of Year of Awards Granted in Prior Years that remain outstanding and unvested$3,873,645 $1,023,690 
Change in Fair Value from Prior December 31 to Vesting Date for Awards that vested during Year$516,493 $405,845 
Deduction of Fair Value of Awards Granted in Prior Years that were forfeited during Year— — 
Increase based upon Incremental Fair Value of Awards modified during Year— — 
Increase based on Dividends or Other Earnings Paid during Year prior to Vesting Date of Award— — 
Total$22,427,771 $5,096,980 
Stock Award Fair Value was calculated based on the probable outcome of performance conditions as of the relevant measurement date, consistent with the approach described on page 64.
Pension Service Cost The addition of Pension Service Costs reflects the annual service costs for the Pension Plan and supplemental pension plans described on page 69.
4Womack: Pension Plan - $48,854; SBP-P and SERP - $707,523
4Average Non-PEO NEOs: Pension Plan - $47,085; SBP-P and SERP - $325,509
There were no plan amendments during the covered year that resulted in prior service costs.
        
Non-PEO NEO Average Total Compensation Amount     $ 5,207,018 $ 5,555,346 $ 5,668,554 $ 5,210,958 $ 7,160,434
Non-PEO NEO Average Compensation Actually Paid Amount     $ 7,724,411 6,433,480 6,722,302 7,015,374 6,386,601
Adjustment to Non-PEO NEO Compensation Footnote    
To calculate Compensation Actually Paid (CAP) to the CEO for 2024, the following amounts were deducted from and added to the “Total” compensation amount for the CEO reflected in each year’s Summary Compensation Table (SCT):
2024 Fiscal Year
Summary
Compensation
Total
($)		Minus: SCT
“Stock Awards”
($)		Minus: SCT “Change in
Pension Value and
Nonqualified Deferred
Compensation”
($)		Add: Stock
Award
Fair Value
($)		Add: Pension
Service Costs
($)
Compensation
Actually Paid
($)
PEO
23,885,173 11,725,994 7,142,735 22,427,771 756,377 28,200,592 
Average
Non-PEO NEOs		5,207,018 2,436,842 515,338 5,096,980 372,593 7,724,411 
The deductions of “Stock Awards” and “Change in Pension Value and Nonqualified Deferred Compensation” are found in columns (d) and (f) of the SCT for each covered year.
Stock Award Fair Value The addition of Stock Award Fair Value reflects:
PEO
Average
Non-PEO NEOs
Fair Value of Awards Granted during Year that remain unvested as of Year-End$18,037,633 $3,667,445 
Fair Value of Awards Granted during Year that vested during such Year— — 
Change in Fair Value from prior December 31 to December 31 of Year of Awards Granted in Prior Years that remain outstanding and unvested$3,873,645 $1,023,690 
Change in Fair Value from Prior December 31 to Vesting Date for Awards that vested during Year$516,493 $405,845 
Deduction of Fair Value of Awards Granted in Prior Years that were forfeited during Year— — 
Increase based upon Incremental Fair Value of Awards modified during Year— — 
Increase based on Dividends or Other Earnings Paid during Year prior to Vesting Date of Award— — 
Total$22,427,771 $5,096,980 
Stock Award Fair Value was calculated based on the probable outcome of performance conditions as of the relevant measurement date, consistent with the approach described on page 64.
Pension Service Cost The addition of Pension Service Costs reflects the annual service costs for the Pension Plan and supplemental pension plans described on page 69.
4Womack: Pension Plan - $48,854; SBP-P and SERP - $707,523
4Average Non-PEO NEOs: Pension Plan - $47,085; SBP-P and SERP - $325,509
There were no plan amendments during the covered year that resulted in prior service costs.
        
Compensation Actually Paid vs. Total Shareholder Return    
Compensation Actually Paid v. Southern TSR & Peer Group TSR
03_438571-1_bar_pvp disclosure_peergrp-TSR.jpg
        
Compensation Actually Paid vs. Net Income    
Compensation Actually Paid vs. Net Income
03_438571-1_bar_pvp disclosure_net-income.jpg
Compensation Actually Paid vs. 1-Yr rTSR*
03_438571-1_bar_pvp disclosure_rTSR.jpg
*    As noted above, our 2024 LTI program utilized and applied significant weighting to our 3-year relative TSR metric, rather than the 1-year relative TSR metric shown. For more information, see page 54. 		       
Compensation Actually Paid vs. Company Selected Measure    
Compensation Actually Paid vs. Net Income
03_438571-1_bar_pvp disclosure_net-income.jpg
Compensation Actually Paid vs. 1-Yr rTSR*
03_438571-1_bar_pvp disclosure_rTSR.jpg
*    As noted above, our 2024 LTI program utilized and applied significant weighting to our 3-year relative TSR metric, rather than the 1-year relative TSR metric shown. For more information, see page 54. 		       
Total Shareholder Return Vs Peer Group    
Compensation Actually Paid v. Southern TSR & Peer Group TSR
03_438571-1_bar_pvp disclosure_peergrp-TSR.jpg
        
Tabular List, Table    
1-year Relative TSR
3-year Relative TSR
Return on Equity (ROE)
Earnings per Share (EPS)
GHG Reduction Metric
        
Total Shareholder Return Amount     $ 157.57 129.49 126.71 117.07 100.63
Peer Group Total Shareholder Return Amount     122.12 101.02 111.24 113.92 99.38
Net Income (Loss)     $ 4,401,000,000 $ 3,976,000,000 $ 3,524,000,000 $ 2,393,000,000 $ 3,119,000,000
Company Selected Measure Amount | percentile     68 86 77 45 70
PEO Name Thomas A. Fanning Christopher C. Womack Christopher C. Womack   Thomas A. Fanning Thomas A. Fanning Thomas A. Fanning
Additional 402(v) Disclosure    
This disclosure has been prepared in accordance with the SEC’s pay versus performance rules in Item 402(v) of Regulation S-K under the 1934 Act (Item 402(v)) and does not necessarily reflect value actually realized by the NEOs or how the Compensation Committee evaluates compensation decisions in light of Company or individual performance. For a discussion of how the Compensation Committee seeks to align pay with performance when making compensation decisions, see the Compensation Discussion and Analysis beginning on page 41.
The following tables and related disclosures provide information about (i) the total compensation of our principal executive officers (CEOs or PEOs) and our non-CEO NEOs (collectively, the Other NEOs) as presented in the Summary Compensation Table on page 64, (ii) the compensation actually paid (CAP) to our CEOs and our Other NEOs, as calculated pursuant to Item 402(v), (iii) certain financial performance measures and (iv) the relationship of CAP to those financial performance measures.
Descriptions of Relationships Between CAP and Certain Financial Performance Measure Results The following charts provide, across the Covered Years, a clear description of the relationships between (1) our cumulative TSR and the cumulative TSR for the peer group reflected in the PVP Table above, (2) PEO CAP and the financial performance measures results set forth in columns (f), (h) and (i) of the PVP Table above and (3) non-PEO NEO CAP and the financial performance measures results set forth in columns (f), (h) and (i) of the PVP Table above. 		       
Measure:: 1              
Pay vs Performance Disclosure              
Name     1-year Relative TSR        
Non-GAAP Measure Description    
For each Covered Year, our absolute TSR was calculated based on the yearly percentage change in our cumulative TSR on our common stock, par value $5.00 per share, measured as the quotient of (a) the sum of (i) the cumulative amount of dividends for the period beginning with our closing stock price on the NYSE on December 31, 2019 through and including the last day of the covered year (each, a Measurement Period), assuming dividend reinvestment, plus (ii) the difference between our closing stock price at the end versus the beginning of the Measurement Period, divided by (b) our closing share price at the beginning of the Measurement Period. Each of these yearly percentage changes was then applied to a deemed fixed investment of $100 at the beginning of each Measurement Period to produce the Covered Year-end values of such investment as of the end of the Covered Year, as applicable. Because Covered Years are presented in the table in reverse chronological order (from top to bottom), the table should be read from bottom to top for purposes of understanding cumulative returns over time.
For purposes of this PvP disclosure, our relative TSR is calculated substantially as described above in our Compensation Discussion and Analysis. See page 54 for more information on the calculation of relative TSR and the results shown in this Pay Versus Performance disclosure.
        
Measure:: 2              
Pay vs Performance Disclosure              
Name     3-year Relative TSR        
Measure:: 3              
Pay vs Performance Disclosure              
Name     Return on Equity (ROE)        
Measure:: 4              
Pay vs Performance Disclosure              
Name     Earnings per Share (EPS)        
Measure:: 5              
Pay vs Performance Disclosure              
Name     GHG Reduction Metric        
Womack [Member]              
Pay vs Performance Disclosure              
PEO Total Compensation Amount     $ 23,885,173 $ 23,521,052      
PEO Actually Paid Compensation Amount     28,200,592 18,378,941      
Fanning [Member]              
Pay vs Performance Disclosure              
PEO Total Compensation Amount     0 33,469,800 $ 24,006,670 $ 21,243,559 $ 22,366,850
PEO Actually Paid Compensation Amount     0 $ 40,567,478 $ 42,131,615 $ 35,516,807 $ 23,821,625
PEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (7,142,735)        
PEO | Aggregate Pension Adjustments Service Cost              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     756,377        
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (11,725,994)        
PEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     22,427,771        
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     18,037,633        
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     3,873,645        
PEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     516,493        
PEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Change In Fair Value Based Upon Awards Modified During Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (515,338)        
Non-PEO NEO | Aggregate Pension Adjustments Service Cost              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     372,593        
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (2,436,842)        
Non-PEO NEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     5,096,980        
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     3,667,445        
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     1,023,690        
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     405,845        
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
Non-PEO NEO | Change In Fair Value Based Upon Awards Modified During Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     $ 0