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Derivatives - Contingent Features (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 20
Alabama Power [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	5
Georgia Power [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	5
Gulf Power [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	7
Mississippi Power [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	3
Southern Power [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 0

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

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