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Acquisitions and Dispositions - Schedule of Pro Forma Consolidated Information (Details) - SOUTHERN Co GAS
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Operating revenues | $ $ 16,609
Net income attributable to Southern Company | $ $ 2,394
Basic EPS (in dollars per share) | $ / shares $ 2.52
Diluted EPS (in dollars per share) | $ / shares $ 2.51