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Derivatives - Pre-tax Effects of Derivatives Designated as Cash Flow Hedging Instruments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Interest Expense [Member]
Jun. 30, 2012
Interest Expense [Member]
Jun. 30, 2013
Interest Expense [Member]
Jun. 30, 2012
Interest Expense [Member]
Jun. 30, 2013
Interest Expense [Member]
Alabama Power [Member]
Jun. 30, 2012
Interest Expense [Member]
Alabama Power [Member]
Jun. 30, 2013
Interest Expense [Member]
Alabama Power [Member]
Jun. 30, 2012
Interest Expense [Member]
Alabama Power [Member]
Jun. 30, 2013
Interest Expense [Member]
Southern Power [Member]
Jun. 30, 2012
Interest Expense [Member]
Southern Power [Member]
Jun. 30, 2013
Interest Expense [Member]
Southern Power [Member]
Jun. 30, 2012
Interest Expense [Member]
Southern Power [Member]
Jun. 30, 2013
Energy Related Derivative [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Jun. 30, 2013
Energy Related Derivative [Member]
Alabama Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Alabama Power [Member]
Jun. 30, 2013
Energy Related Derivative [Member]
Georgia Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Georgia Power [Member]
Jun. 30, 2013
Energy Related Derivative [Member]
Gulf Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Gulf Power [Member]
Jun. 30, 2013
Energy Related Derivative [Member]
Mississippi Power [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Mississippi Power [Member]
Jun. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets current [Member]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 30, 2013
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory assets deferred [Member]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities current [Member]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 30, 2013
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Dec. 31, 2012
Energy Related Derivative [Member]
Other regulatory liabilities deferred [Member]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 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]
Jun. 30, 2013
Interest rate derivatives [Member]
Jun. 30, 2012
Interest rate derivatives [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Jun. 30, 2012
Interest rate derivatives [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Alabama Power [Member]
Jun. 30, 2012
Interest rate derivatives [Member]
Alabama Power [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Alabama Power [Member]
Jun. 30, 2012
Interest rate derivatives [Member]
Alabama Power [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Southern Power [Member]
Jun. 30, 2012
Interest rate derivatives [Member]
Southern Power [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Southern Power [Member]
Jun. 30, 2012
Interest rate derivatives [Member]
Southern Power [Member]
Derivative Instruments, Gain (Loss) [Line Items]                                                                                                                                                    
Total energy-related derivative gains (losses)                         $ (74) $ (86) $ (11) $ (13) $ (29) $ (34) $ (21) $ (23) $ (13) $ (16) $ (54) $ (74) $ (10) $ (14) $ (21) $ (30) $ (14) $ (17) $ (9) $ (13) $ (34) $ (35) $ (5) $ (4) $ (12) $ (15) $ (11) $ (10) $ (6) $ (6) $ 7 $ 10 $ 2 $ 2 $ 2 $ 6 $ 2 $ 1 $ 1 $ 1 $ 7 $ 13 $ 2 $ 3 $ 2 $ 5 $ 2 $ 3 $ 1 $ 2                        
Pre-tax effect of derivatives designated as cash flow hedging instruments                                                                                                                                                    
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)                                                                                                                             0 (18) 0 (12) 0 (18) 0 (11) 0 0 0 0
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) $ (5) $ (4) $ (10) $ (7) $ (1) $ 0 $ (1) $ 0 $ (3) $ (3) $ (6) $ (5)