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Derivatives - Schedule of Derivatives and Gains (Losses) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Notional amount of interest rate derivatives  
Notional Amount $ 350
Interest Rate Paid, basis spread on LIBOR 1.96% [1]
Fair Value Hedging [Member]
 
Notional amount of interest rate derivatives  
Interest Rate Received 4.15%
Interest Rate Paid 3-month LIBOR  + 1.96% [1]
Hedge Maturity Date May 01, 2014
Fair Value Gain (Loss) June 30, 2013 $ 6
Gas [Member]
 
Energy-related derivative contracts  
Net Purchased mmBtu 270,000,000
Longest Hedge Date 2017
Longest Non-Hedge Date 2017
Gas [Member] | Alabama Power [Member]
 
Energy-related derivative contracts  
Net Purchased mmBtu 68,000,000
Longest Hedge Date 2017
Gas [Member] | Georgia Power [Member]
 
Energy-related derivative contracts  
Net Purchased mmBtu 78,000,000
Longest Hedge Date 2017
Gas [Member] | Gulf Power [Member]
 
Energy-related derivative contracts  
Net Purchased mmBtu 79,000,000
Longest Hedge Date 2017
Gas [Member] | Mississippi Power [Member]
 
Energy-related derivative contracts  
Net Purchased mmBtu 43,000,000
Longest Hedge Date 2017
Gas [Member] | Southern Power [Member]
 
Energy-related derivative contracts  
Net Purchased mmBtu 2,000,000
Longest Non-Hedge Date 2017
[1] (a)Weighted average