XML 99 R60.htm IDEA: XBRL DOCUMENT v3.7.0.1
Acquisitions - Schedule of Pro Forma Consolidated Information (Details) - Southern Company Gas [Member]
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Operating revenues | $ $ 5,320
Net income attributable to Southern Company | $ $ 650
Basic EPS (in dollars per share) | $ / shares $ 0.70
Diluted EPS (in dollars per share) | $ / shares $ 0.69