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Introduction (Tables)
 3 Months Ended
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Asset Retirement Obligations
In the second quarter 2015, Southern Company and the traditional operating companies expect to record incremental asset retirement obligations (ARO) related to the CCR Rule in amounts currently estimated to fall within the following ranges:
 
Low
 
High
 
(in millions)
Southern Company
$
525

 
$
575

Alabama Power
$
330

 
$
350

Georgia Power
$
10

 
$
20

Gulf Power
$
70

 
$
80

Mississippi Power
$
75

 
$
85