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Acquisitions - Schedule of Pro Forma Consolidated Information (Details) - Southern Company Gas [Member] - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]    
Operating revenues $ 16,609 $ 16,865
Net income attributable to Southern Company $ 2,369 $ 2,269
Basic EPS (in dollars per share) $ 2.50 $ 2.43
Diluted EPS (in dollars per share) $ 2.48 $ 2.42