Introduction - Narrative (Details) $ in Millions				3 Months Ended			6 Months Ended
		Aug. 05, 2015 USD ($)	Feb. 06, 2015 MW	Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)
Public Utility, Property, Plant and Equipment [Line Items]
Decrease to net income	[1]			$ (629)	[2]	$ (611)	$ (1,138)	[3]	$ (962)	[3]
Asset Retirement Obligation, Liabilities Incurred							612
Gulf Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Decrease in retail revenues				(327)		(310)	(620)		(613)
Decrease to net income				(35)		(34)	(72)		(71)
Asset Retirement Obligation, Liabilities Incurred							71
Georgia Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Decrease in retail revenues				(1,872)		(2,000)	(3,686)		(4,050)
Decrease to net income				(277)		(311)	(513)		(577)
Asset Retirement Obligation, Liabilities Incurred							0
Mississippi Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Decrease in retail revenues				(189)		(211)	(357)		(418)
Decrease to net income				(49)		$ (62)	(84)		$ 110
Asset Retirement Obligation, Liabilities Incurred							$ 97
Plant Smith Units 1 and 2 [Member] | Gulf Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Capacity Of Units Included In Request For Decertification Of Units (in MWs) | MW			357
Restatement Adjustment [Member] | Georgia Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Decrease in retail revenues				75
Decrease to net income				$ 47
Minimum [Member] | Scenario, Forecast [Member] | Gulf Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Asset Retirement Obligation, Liabilities Incurred		$ 15
Maximum [Member] | Scenario, Forecast [Member] | Gulf Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Asset Retirement Obligation, Liabilities Incurred		$ 35

[1] After dividends on preferred and preference stock of subsidiaries.

[2] Segment net income (loss) for the traditional operating companies for the three months ended June 30, 2015 includes a $23 million pre-tax charge ($14 million after tax) for estimated probable losses on the Kemper IGCC. See Note (B) under "Integrated Coal Gasification Combined Cycle – Kemper IGCC Schedule and Cost Estimate" herein for additional information.

[3] Segment net income (loss) for the traditional operating companies for the six months ended June 30, 2015 and June 30, 2014 includes a $32 million pre-tax charge ($20 million after tax) and a $380 million pre-tax charge ($235 million after tax), respectively, for estimated probable losses on the Kemper IGCC. See Note (B) under "Integrated Coal Gasification Combined Cycle – Kemper IGCC Schedule and Cost Estimate" herein for additional information.