Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Southern Company [Member]
Net cash paid for capitalized interest	$ 57	$ 47
Alabama Power [Member]
Net cash paid for capitalized interest	10	8
Georgia Power [Member]
Net cash paid for capitalized interest	5	8
Gulf Power [Member]
Net cash paid for capitalized interest	3	2
Mississippi Power [Member]
Interest paid	39	37
Net cash paid for capitalized interest	37	29
Southern Power [Member]
Net cash paid for capitalized interest	$ 1	$ 0