Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Net cash paid for capitalized interest	$ 61	$ 57
Alabama Power [Member]
Net cash paid for capitalized interest	7	10
Georgia Power [Member]
Net cash paid for capitalized interest	10	5
Gulf Power [Member]
Net cash paid for capitalized interest	0	3
Mississippi Power [Member]
Interest paid	49	39
Net cash paid for capitalized interest	23	37
Southern Power [Member]
Net cash paid for capitalized interest	$ 21	$ 1