Effective Tax Rate - Narrative (Details)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Effective Tax Rate and Unrecognized Tax Benefits (Textual) [Abstract]
Effective tax rate	33.30%	31.40%
Alabama Power [Member]
Effective Tax Rate and Unrecognized Tax Benefits (Textual) [Abstract]
Effective tax rate	39.30%	39.20%
Georgia Power [Member]
Effective Tax Rate and Unrecognized Tax Benefits (Textual) [Abstract]
Effective tax rate	37.00%	38.20%
Gulf Power [Member]
Effective Tax Rate and Unrecognized Tax Benefits (Textual) [Abstract]
Effective tax rate	37.30%	37.70%
Mississippi Power [Member]
Effective Tax Rate and Unrecognized Tax Benefits (Textual) [Abstract]
Effective tax rate	(51.10%)	(41.00%)
Southern Power [Member]
Effective Tax Rate and Unrecognized Tax Benefits (Textual) [Abstract]
Effective tax rate	0.30%	25.10%