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Derivatives - Pre-tax Effects of Derivatives Designated as Cash Flow Hedging Instruments (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 9 Months Ended
Sep. 30, 2013
Interest Expense [Member]
Sep. 30, 2012
Interest Expense [Member]
Sep. 30, 2013
Interest Expense [Member]
Alabama Power [Member]
Sep. 30, 2012
Interest Expense [Member]
Alabama Power [Member]
Sep. 30, 2013
Interest Expense [Member]
Southern Power [Member]
Sep. 30, 2012
Interest Expense [Member]
Southern Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Alabama Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Alabama Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Georgia Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Georgia Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Gulf Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Gulf Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Mississippi Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Mississippi Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Alabama Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Alabama Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Georgia Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Georgia Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Gulf Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Gulf Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Mississippi Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Mississippi Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Alabama Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Alabama Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Georgia Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Georgia Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Gulf Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Gulf Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Mississippi Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Mississippi Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Alabama Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Alabama Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Georgia Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Georgia Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Gulf Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Gulf Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Mississippi Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Mississippi Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Alabama Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Alabama Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Georgia Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Georgia Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Gulf Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Gulf Power [Member]
Sep. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Mississippi Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Mississippi Power [Member]
Sep. 30, 2013
Interest rate derivatives [Member]
Sep. 30, 2012
Interest rate derivatives [Member]
Sep. 30, 2013
Interest rate derivatives [Member]
Alabama Power [Member]
Sep. 30, 2012
Interest rate derivatives [Member]
Alabama Power [Member]
Sep. 30, 2013
Interest rate derivatives [Member]
Southern Power [Member]
Sep. 30, 2012
Interest rate derivatives [Member]
Southern Power [Member]
Derivative Instruments, Gain (Loss) [Line Items]                                                                                                                            
Total energy-related derivative gains (losses)             $ (74) $ (86) $ (12) $ (13) $ (27) $ (34) $ (22) $ (23) $ (13) $ (16) $ (48) $ (74) $ (9) $ (14) $ (19) $ (30) $ (13) $ (17) $ (7) $ (13) $ (35) $ (35) $ (6) $ (4) $ (10) $ (15) $ (12) $ (10) $ (7) $ (6) $ 6 $ 10 $ 2 $ 2 $ 1 $ 6 $ 2 $ 1 $ 1 $ 1 $ 3 $ 13 $ 1 $ 3 $ 1 $ 5 $ 1 $ 3 $ 0 $ 2            
Pre-tax effect of derivatives designated as cash flow hedging instruments                                                                                                                            
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)                                                                                                                 0 (16) 0 (15) 0 0
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) $ (12) $ (12) $ (2) $ 0 $ (6) $ (8)