Common Stock and Stock Compensation - Textual (Details) (USD $)	12 Months Ended
Dec. 31, 2012 Employee	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation [Abstract]
Stock Issued During Period, Shares, Southern Investment Plan and employee and director stock plans	12,100,000	21,900,000
Stock Issued During Period, Value, Southern Investment Plan and employee and director stock plans	$ 397,000,000	$ 723,000,000
Stock Repurchased From Stock Option Exercised	9,000,000
Stock Repurchased During Period, Value	430,000,000
Share-based compensation arrangement by Share-based payment award, number of shares reserved for issuance, pursuant to Stock-based compensation plan	130,000,000
Number of employees participating in stock option program	6,026
Weighted average remaining contractual term for options outstanding	6 years
Weighted average remaining contractual term for options exercisable	5 years
Aggregate intrinsic value for options outstanding	243,000,000
Aggregate intrinsic value for options exercisable	199,000,000
Total unrecognized compensation cost related to award	8,000,000
Total compensation cost for award recognized in income	23,000,000	22,000,000	22,000,000
Total compensation cost for award recognized in income, tax benefit	9,000,000	8,000,000	9,000,000
Total intrinsic value of options exercised	162,000,000	155,000,000	57,000,000
Actual tax benefit for the tax deduction from stock option exercised	62,000,000	60,000,000	22,000,000
Cash received from issuance related to option exercise	397,000,000	528,000,000	198,000,000
Minimum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	0.00%
Maximum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	200.00%
Risk-free rate based on the U.S Treasury yield curve	0.90%	2.30%	2.40%
Diluted Earnings Per Share [Abstract]
Assumed average stock price	$ 47.89	$ 42.67
Undistributed retained earnings of the subsidiaries	6,400,000,000
Stock Options [Member]
Share-based Compensation [Abstract]
Option expiration period from date of grant	10 years
Performance Share Plan [Member]
Share-based Compensation [Abstract]
Total unrecognized compensation cost related to award	33,000,000
Total unrecognized compensation cost related to award, weighted average period	11 months
Total compensation cost for award recognized in income	28,000,000	18,000,000	9,000,000
Total compensation cost for award recognized in income, tax benefit	11,000,000	7,000,000	4,000,000
Vesting period of performance share units issued under Performance Share Plan	3 years
Risk-free rate based on the U.S Treasury yield curve	0.40%	1.40%	1.40%
Performance share units, unvested	1,633,156	1,719,598
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	1,137,817
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 43.05
Performance share units, granted	842,447
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	842,710
Performance unit shares, forfeited	86,179
Georgia Power [Member]
Share-based Compensation [Abstract]
Number of employees participating in stock option program	1,402
Remaining shares available for awards	39,000,000
Option expiration period from date of grant	10 years
Weighted average remaining contractual term for options outstanding	6 years
Weighted average remaining contractual term for options exercisable	5 years
Aggregate intrinsic value for options outstanding	45,000,000
Aggregate intrinsic value for options exercisable	37,000,000
Total intrinsic value of options exercised	34,000,000	32,000,000	12,000,000
Vesting period of performance share units issued under Performance Share Plan	3 years
Minimum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	0.00%
Maximum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	200.00%
Risk-free rate based on the U.S Treasury yield curve	0.90%	2.30%	2.40%
Georgia Power [Member] \| Performance Shares [Member]
Share-based Compensation [Abstract]
Vesting period of performance share units issued under Performance Share Plan	3 years
Performance share units, unvested	280,000	325,958
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	242,938
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 43.05
Performance share units, granted	152,812
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	179,917
Performance unit shares, forfeited	18,853
Georgia Power [Member] \| Performance Share Plan [Member]
Share-based Compensation [Abstract]
Total unrecognized compensation cost related to award, weighted average period	11 months
Risk-free rate based on the U.S Treasury yield curve	0.40%	1.40%	1.40%
Alabama Power [Member]
Share-based Compensation [Abstract]
Number of employees participating in stock option program	1,057
Remaining shares available for awards	39,000,000
Weighted average remaining contractual term for options outstanding	6 years
Weighted average remaining contractual term for options exercisable	5 years
Aggregate intrinsic value for options outstanding	43,000,000
Aggregate intrinsic value for options exercisable	35,000,000
Total unrecognized compensation cost related to award	1,000,000
Total unrecognized compensation cost related to award, weighted average period	11 months
Total compensation cost for award recognized in income	4,000,000	3,000,000	3,000,000
Total compensation cost for award recognized in income, tax benefit	1,000,000	1,000,000	1,000,000
Total intrinsic value of options exercised	28,000,000	23,000,000	12,000,000
Actual tax benefit for the tax deduction from stock option exercised	11,000,000	9,000,000	4,000,000
Risk-free rate based on the U.S Treasury yield curve	0.90%	2.30%	2.40%
Alabama Power [Member] \| Performance Shares [Member]
Share-based Compensation [Abstract]
Total unrecognized compensation cost related to award	5,000,000
Total unrecognized compensation cost related to award, weighted average period	11 months
Total compensation cost for award recognized in income	5,000,000	3,000,000	1,000,000
Total compensation cost for award recognized in income, tax benefit	2,000,000	1,000,000	1,000,000
Vesting period of performance share units issued under Performance Share Plan	3 years
Minimum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	0.00%
Maximum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	200.00%
Performance share units, unvested	280,536	287,720
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	180,997
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 43.05
Performance share units, granted	131,820
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	134,054
Performance unit shares, forfeited	4,950
Alabama Power [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Option expiration period from date of grant	10 years
Alabama Power [Member] \| Performance Share Plan [Member]
Share-based Compensation [Abstract]
Risk-free rate based on the U.S Treasury yield curve	0.40%	1.40%	1.40%
Gulf Power [Member]
Share-based Compensation [Abstract]
Number of employees participating in stock option program	218
Option expiration period from date of grant	10 years
Weighted average remaining contractual term for options outstanding	6 years
Weighted average remaining contractual term for options exercisable	5 years
Aggregate intrinsic value for options outstanding	9,700,000
Aggregate intrinsic value for options exercisable	7,800,000
Total unrecognized compensation cost related to award	300,000
Total unrecognized compensation cost related to award, weighted average period	11 months
Total compensation cost for award recognized in income	700,000	700,000	800,000
Total compensation cost for award recognized in income, tax benefit	300,000	300,000	300,000
Total intrinsic value of options exercised	3,800,000	3,200,000	1,600,000
Actual tax benefit for the tax deduction from stock option exercised	1,500,000	1,200,000	600,000
Vesting period of performance share units issued under Performance Share Plan	3 years
Minimum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	0.00%
Maximum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	200.00%
Risk-free rate based on the U.S Treasury yield curve	0.90%	2.30%	2.40%
Gulf Power [Member] \| Performance Shares [Member]
Share-based Compensation [Abstract]
Total unrecognized compensation cost related to award	1,000,000
Total compensation cost for award recognized in income	1,000,000	700,000	300,000
Total compensation cost for award recognized in income, tax benefit	400,000	300,000	100,000
Gulf Power [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Total unrecognized compensation cost related to award, weighted average period	11 months
Gulf Power [Member] \| Performance Share Plan [Member]
Share-based Compensation [Abstract]
Total unrecognized compensation cost related to award, weighted average period	11 months
Vesting period of performance share units issued under Performance Share Plan	3 years
Risk-free rate based on the U.S Treasury yield curve	0.40%	1.40%	1.40%
Performance share units, unvested	68,805	66,662
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	36,105
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 43.05
Performance share units, granted	29,444
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	26,738
Performance unit shares, forfeited	563
Mississippi Power [Member]
Share-based Compensation [Abstract]
Vesting period of performance share units issued under Performance Share Plan	3 years
Mississippi Power [Member] \| Performance Shares [Member]
Share-based Compensation [Abstract]
Total unrecognized compensation cost related to award	1,400,000
Total unrecognized compensation cost related to award, weighted average period	11 months
Total compensation cost for award recognized in income	1,200,000	700,000	300,000
Total compensation cost for award recognized in income, tax benefit	400,000	300,000	100,000
Vesting period of performance share units issued under Performance Share Plan	3 years
Minimum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	0.00%
Maximum Percentage of transfer performance shares to common stock based on actual Total Shareholder Return	200.00%
Performance share units, unvested	68,486	70,830
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	43,481
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 43.05
Performance share units, granted	33,077
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	32,208
Performance unit shares, forfeited	3,213
Mississippi Power [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Number of employees participating in stock option program	241
Remaining shares available for awards	39,000,000
Option expiration period from date of grant	10 years
Weighted average remaining contractual term for options outstanding	6 years
Weighted average remaining contractual term for options exercisable	5 years
Aggregate intrinsic value for options outstanding	9,300,000
Aggregate intrinsic value for options exercisable	7,700,000
Total unrecognized compensation cost related to award	300,000
Total unrecognized compensation cost related to award, weighted average period	11 months
Total compensation cost for award recognized in income	900,000	800,000	800,000
Total compensation cost for award recognized in income, tax benefit	300,000	300,000	300,000
Total intrinsic value of options exercised	4,900,000	4,200,000	2,700,000
Actual tax benefit for the tax deduction from stock option exercised	$ 1,900,000	$ 1,600,000	$ 1,000,000
Risk-free rate based on the U.S Treasury yield curve	0.90%	2.30%	2.40%
Mississippi Power [Member] \| Performance Share Plan [Member]
Share-based Compensation [Abstract]
Risk-free rate based on the U.S Treasury yield curve	0.40%	1.40%	1.40%
Southern Company Common Stock [Member]
Share-based Compensation [Abstract]
Remaining shares available for awards	39,000,000
Southern Company Common Stock [Member] \| Gulf Power [Member]
Share-based Compensation [Abstract]
Remaining shares available for awards	39,000,000
Maximum [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award Exercisable Period	3 years
Maximum [Member] \| Georgia Power [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award Exercisable Period	3 years
Maximum [Member] \| Alabama Power [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award Exercisable Period	3 years
Maximum [Member] \| Gulf Power [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award Exercisable Period	3 years
Maximum [Member] \| Mississippi Power [Member] \| Stock Options [Member]
Share-based Compensation [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award Exercisable Period	3 years

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section B

-Paragraph 11A

-Chapter 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

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