Financing Debt Instruments (Details) (USD $)	6 Months Ended					6 Months Ended					0 Months Ended	6 Months Ended						6 Months Ended	1 Months Ended						1 Months Ended		6 Months Ended			1 Months Ended					6 Months Ended							6 Months Ended					6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Debt Redemptions [Member]		Jun. 30, 2014 Debt Issuances [Member]	Jun. 30, 2014 Traditional Operating Companies [Member]	Jun. 30, 2014 Southern Company [Member]	Jun. 30, 2013 Southern Company [Member]	Jun. 30, 2014 Southern Company [Member] Debt Redemptions [Member]		Jun. 30, 2014 Southern Company [Member] Debt Issuances [Member]	Feb. 20, 2014 Georgia Power [Member]	Jun. 30, 2014 Georgia Power [Member]	Feb. 20, 2014 Georgia Power [Member] Line of Credit [Member] Debt Due Two Thousand Forty Four [Member]	Feb. 20, 2014 Georgia Power [Member] Line of Credit [Member] Debt Due Two Thousand Twenty Nine [Member]	Jun. 30, 2014 Georgia Power [Member] Debt Redemptions [Member]		Jun. 30, 2014 Georgia Power [Member] Debt Issuances [Member]	Jun. 30, 2014 Gulf Power [Member]	Jun. 30, 2014 Gulf Power [Member] Series 2012 [Member]	Jun. 30, 2014 Gulf Power [Member] Debt Redemptions [Member]		Apr. 01, 2014 Gulf Power [Member] Debt Redemptions [Member]	Jun. 30, 2014 Gulf Power [Member] Debt Issuances [Member]	Apr. 01, 2014 Gulf Power [Member] Debt Issuances [Member]	May 31, 2014 Mississippi Power [Member]	Jan. 31, 2014 Mississippi Power [Member]	Jun. 30, 2014 Mississippi Power [Member]		Jun. 30, 2013 Mississippi Power [Member]	May 31, 2014 Mississippi Power [Member] Series 2013A [Member]	Jun. 30, 2014 Mississippi Power [Member] Debt Redemptions [Member]		Jun. 30, 2014 Mississippi Power [Member] Debt Issuances [Member]		Jun. 30, 2014 Southern Power [Member]	Jun. 30, 2014 Southern Power [Member] Debt Due April Thirtieth Two Thousand Thirty Three [Member]	Jun. 30, 2014 Southern Power [Member] Debt Due April Thirtieth Two Thousand Thirty Four [Member]	Jun. 30, 2014 Southern Power [Member] Debt Due May Thirty First Two Thousand Thirty Four [Member]	Jun. 30, 2014 Southern Power [Member] Debt Redemptions [Member]		Jun. 30, 2014 Southern Power [Member] Debt Issuances [Member]	Jun. 30, 2014 Other Subsidiaries [Member]	Jun. 30, 2014 Other Subsidiaries [Member] Debt Redemptions [Member]		Jun. 30, 2014 Other Subsidiaries [Member] Debt Issuances [Member]	Jun. 30, 2014 Plant Vogtle Units 3 And 4 [Member] Georgia Power [Member]	Jun. 30, 2014 Consolidation, Eliminations [Member]		Jun. 30, 2014 Consolidation, Eliminations [Member] Debt Redemptions [Member]		Jun. 30, 2014 Consolidation, Eliminations [Member] Debt Issuances [Member]
Debt Instrument [Line Items]
Remarketing Revenue Bond																		$ 13,000,000
Maturities of Senior Debt	350,000,000					350,000,000						0						0									0	[1]							0							0					0	[2]
Revenue Bond Issuances	42,000,000					0						0						42,000,000	13,000,000								0	[1]							0							0					0	[2]
Revenue Bond Redemptions	66,000,000					0						37,000,000						29,000,000									0	[1]							0							0					0	[2]
Line of Credit Facility, Current Borrowing Capacity											1,000,000,000
Jointly Owned Utility Plant, Proportionate Ownership Share																																														45.70%
Amount of Variable Rate Pollution Control Revenue Bonds Outstanding Requiring Liquidity Support	1,700,000,000				495,000,000
Debt Instrument, Face Amount													500,000,000	500,000,000
Other Long-term Debt		15,000,000	[3]	1,272,000,000				0	[3]	0					3,000,000	[3]	1,000,000,000			0	[3]		0								1,000,000	[1],[3]	482,000,000	[1]					1,000,000	[3]	10,000,000		10,000,000	[3]	0				0	[2],[3]	(220,000,000)	[2]
Debt Instrument, Interest Rate, Stated Percentage													3.86%	3.488%
Payments of Debt Issuance Costs											66,000,000
Long-term Pollution Control Bond																						29,075,000.000		29,075,000.000
Bank Loans Period Of Extension																									19 months	18 months
Aggregate Principal Amount Of Floating Rate Bank Loan																									220,000,000	250,000,000
Taxable Revenue Bond																														12,300,000
Debt Instrument, Description of Variable Rate Basis																											P1M
Promissory Note																																				800,000	3,800,000	5,300,000
Interest Bearing Refundable Deposit Related to Asset Sale						75,000,000	0																			75,000,000	75,000,000		0
Repayments of Long-term Debt																																			$ 800,000

[1] Includes reductions in capital lease obligations resulting from cash payments under capital leases.

[2] Intercompany loan from Southern Company to Mississippi Power eliminated in Southern Company's Condensed Consolidated Financial Statements.

[3] Includes remarketing by Gulf Power of $13 million aggregate principal amount of revenue bonds previously purchased and held by Gulf Power since December 2013.