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Revenue from Contracts with Customers - Disaggregate Revenue Sources (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 5,627 $ 5,430 $ 11,999 $ 11,202
Other Income 89   183  
Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Lease income 18   36  
Increase (decrease) in revenue from cost recovery mechanisms 68   101  
Residential        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,579   3,118  
Commercial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,315   2,557  
Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 814   1,569  
Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 32   64  
Natural gas distribution revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 642   1,865  
Alternative revenue programs        
Disaggregation of Revenue [Line Items]        
Total operating revenues (4)   (27)  
Total retail electric and gas distribution revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 4,378   9,146  
Wholesale energy revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 459   928  
Revenue from transactions accounted for as derivatives 61   155  
Lease income from PPA contracts 118   187  
Wholesale capacity revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 152   302  
Lease income from PPA contracts 31   61  
Other natural gas revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 68   476  
Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 570   1,147  
SOUTHERN Co GAS        
Disaggregation of Revenue [Line Items]        
Total operating revenues 730 716 2,369 2,276
SOUTHERN Co GAS | Natural gas distribution revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 638   1,838  
SOUTHERN Co GAS | Residential        
Disaggregation of Revenue [Line Items]        
Total operating revenues 273   933  
SOUTHERN Co GAS | Commercial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 76   268  
SOUTHERN Co GAS | Transportation        
Disaggregation of Revenue [Line Items]        
Total operating revenues 7   24  
SOUTHERN Co GAS | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 228   505  
SOUTHERN Co GAS | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 58   135  
SOUTHERN Co GAS | Alternative revenue programs        
Disaggregation of Revenue [Line Items]        
Total operating revenues (4)   (27)  
SOUTHERN Co GAS | Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0   1  
SOUTHERN Co GAS | Gas Marketing Services        
Disaggregation of Revenue [Line Items]        
Total operating revenues 89   359  
Other Income     4  
SOUTHERN Co GAS | Wholesale gas services        
Disaggregation of Revenue [Line Items]        
Total operating revenues (15)   131  
SOUTHERN Co GAS | Gas midstream operations        
Disaggregation of Revenue [Line Items]        
Total operating revenues 18   40  
ALABAMA POWER CO        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,503 1,484 2,976 2,866
Other Income 26   52  
ALABAMA POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,338   2,624  
Increase (decrease) in revenue from cost recovery mechanisms 78   125  
ALABAMA POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total operating revenues 557   1,127  
ALABAMA POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 402   774  
ALABAMA POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 372   710  
ALABAMA POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 7   13  
ALABAMA POWER CO | Wholesale energy revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 71   172  
Revenue from transactions accounted for as derivatives 4   9  
ALABAMA POWER CO | Wholesale capacity revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 25   49  
ALABAMA POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 69   131  
GEORGIA POWER CO        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,048 2,048 4,008 3,880
Other Income 26   53  
GEORGIA POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,889   3,688  
Lease income 18   36  
Increase (decrease) in revenue from cost recovery mechanisms 3   12  
GEORGIA POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total operating revenues 785   1,529  
GEORGIA POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 749   1,466  
GEORGIA POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 335   650  
GEORGIA POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 20   43  
GEORGIA POWER CO | Wholesale energy revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 26   66  
Revenue from transactions accounted for as derivatives 5   13  
GEORGIA POWER CO | Wholesale capacity revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 13   27  
GEORGIA POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 120   227  
Lease income 33   66  
GULF POWER CO        
Disaggregation of Revenue [Line Items]        
Total operating revenues 344 357 692 707
Other Income 2   4  
GULF POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 301   591  
Increase (decrease) in revenue from cost recovery mechanisms (12)   (28)  
GULF POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total operating revenues 172   337  
GULF POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 96   188  
GULF POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 31   63  
GULF POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2   3  
GULF POWER CO | Wholesale energy revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 21   56  
GULF POWER CO | Wholesale capacity revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 6   12  
GULF POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 16   33  
MISSISSIPPI POWER CO        
Disaggregation of Revenue [Line Items]        
Total operating revenues 297 303 598 575
MISSISSIPPI POWER CO | Retail electric revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 212   406  
Increase (decrease) in revenue from cost recovery mechanisms (1)   (8)  
MISSISSIPPI POWER CO | Residential        
Disaggregation of Revenue [Line Items]        
Total operating revenues 65   125  
MISSISSIPPI POWER CO | Commercial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 68   130  
MISSISSIPPI POWER CO | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 76   146  
MISSISSIPPI POWER CO | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 3   5  
MISSISSIPPI POWER CO | Wholesale energy revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 73   167  
MISSISSIPPI POWER CO | Wholesale capacity revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1   5  
MISSISSIPPI POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 11   20  
SOUTHERN POWER CO        
Disaggregation of Revenue [Line Items]        
Total operating revenues 555 529 1,064 979
SOUTHERN POWER CO | Other revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 3   5  
SOUTHERN POWER CO | PPA capacity revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 144   282  
Lease income from PPA contracts 47   94  
SOUTHERN POWER CO | PPA energy revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 302   556  
Revenue from transactions accounted for as derivatives 50   129  
Lease income from PPA contracts 127   203  
SOUTHERN POWER CO | Non-PPA revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 106   221  
Operating Segments | SOUTHERN Co GAS        
Disaggregation of Revenue [Line Items]        
Total operating revenues 734 769 2,405 2,393
Wholesale gas services | Operating Segments | SOUTHERN Co GAS        
Disaggregation of Revenue [Line Items]        
Total operating revenues (16) (12) 150 119
Wholesale gas services | Third Party Gross Revenues | Operating Segments | SOUTHERN Co GAS        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,336 $ 1,531 3,274 $ 3,370
Revenue from transactions accounted for as derivatives $ 700   $ 1,800