Introduction Estimated Cost Of Decommissioning (Details) (Alabama Power [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Public Utilities, General Disclosures [Line Items]
Significant Assumption Of Inflation Rate Used To Determine Costs For Rate Making	4.50%
Site Study Costs	$ 1,442
SignificantAssumption Of Trust Earnings Rate Used To Determine Costs For Rate Making	7.00%
Site Study Cost Radiated Structures [Member]
Public Utilities, General Disclosures [Line Items]
Site Study Costs	1,362
Site Study Cost Non-Radiated Structures [Member]
Public Utilities, General Disclosures [Line Items]
Site Study Costs	$ 80
Plant Farley [Member]
Public Utilities, General Disclosures [Line Items]
Estimated Cost Of Decommissioning Completion Year	2076
Estimated Cost Of Decommissioning Beginning Year	2037