[Line Items] for Debt Disclosure [Table]

No definition available.

Name:	so_DebtDisclosureLineItems
Namespace Prefix:	so_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt affiliated and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	so_LongtermDebtAffiliated
Namespace Prefix:	so_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Redemption Amount Of Principal Notes

+ References

No definition available.

+ Details

Name:	so_RedemptionAmountOfPrincipalNotes
Namespace Prefix:	so_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Temporary Equity, Dividend Rate Percentage

+ References

No definition available.

+ Details

Name:	so_TemporaryEquityDividendRatePercentage
Namespace Prefix:	so_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Unamortized Debt Issuance Expense, Current

+ References

No definition available.

+ Details

Name:	so_UnamortizedDebtIssuanceExpenseCurrent
Namespace Prefix:	so_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735

+ Details

Name:	us-gaap_CapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of current portion of long-term loans payable to bank due within one year or the operating cycle if longer.

+ References

+ Details

Name:	us-gaap_LoansPayableToBankCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Current portion of a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer.

+ References

+ Details

Name:	us-gaap_LongtermPollutionControlBondCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt classified as other, payable within one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherLongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of the portion of long-term notes having the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment.

+ References

+ Details

Name:	us-gaap_SeniorNotesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (27)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764

+ Details

Name:	us-gaap_TemporaryEquityParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (27)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquityRedemptionPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

+ Details

Name:	us-gaap_TemporaryEquitySharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=so_GeorgiaPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=so_SouthernPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=so_AlabamaPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FourPointNineTwoPercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FourPointSevenTwoPercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FourPointSixFourPercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FourPointSixZeroPercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FourPointFiveTwoPercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FourPointTwoZeroPercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FivePointEightThreePercentClassPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_SixPointFourFiveZeroPercentPreferenceStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_SixPointFiveZeroZeroPercentPreferenceStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FivePointTwoZeroPercentClassPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FivePointThreeZeroPercentClassPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FivePointSixTwoFivePercentPreferenceStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=so_MississippiPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FourPointFourZeroPercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=so_FivePointTwoFivePercentRedeemablePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financing - Scheduled Maturities and Redemptions of Securities Due Within One Year (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2015 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Jan. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) shares
Debt Disclosure [Line Items]
2018		$ 2,353		$ 1,697
2019		3,076		1,176
2020		1,326		1,327
Scheduled maturities and redemptions of securities due within one year
Senior notes		1,995		1,810
Other long-term debt		485		829
Pollution control revenue bonds		76		4
Capitalized leases		32		32
Unamortized debt issuance expense		(1)		(1)
Total		2,587		2,674
Total		2,019		1,995
Georgia Power [Member]
Debt Disclosure [Line Items]
2018		748		747
2019		500		502
2020		325		0
Scheduled maturities and redemptions of securities due within one year
Senior notes		450		700
Pollution control revenue bonds		0		4
Capitalized leases		10		8
Total		460		712
Total		450		450
Southern Power [Member]
Debt Disclosure [Line Items]
2018		670
2019		600
2020		300
Scheduled maturities and redemptions of securities due within one year
Total		560		403
Total		561
Long Term Debt and Capital Lease Obligation Maturities Repayments in Year Five		300
Alabama Power [Member]
Debt Disclosure [Line Items]
2019		200		200
2020		250		250
Scheduled maturities and redemptions of securities due within one year
Total		561		200
Total		$ 525		525
Alabama Power [Member] \| 4.92% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.0492
Par Value/Stated Capital Per Share \| $ / shares		$ 100
Temporary Equity, Shares Outstanding \| shares		80,000
Redemption Price Per Share \| $ / shares		$ 103.23
Alabama Power [Member] \| 4.72% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.0472
Par Value/Stated Capital Per Share \| $ / shares		$ 100
Temporary Equity, Shares Outstanding \| shares		50,000
Redemption Price Per Share \| $ / shares		$ 102.18
Alabama Power [Member] \| 4.64% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.0464
Par Value/Stated Capital Per Share \| $ / shares		$ 100
Temporary Equity, Shares Outstanding \| shares		60,000
Redemption Price Per Share \| $ / shares		$ 103.14
Alabama Power [Member] \| 4.60% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.0460
Par Value/Stated Capital Per Share \| $ / shares		$ 100
Temporary Equity, Shares Outstanding \| shares		100,000
Redemption Price Per Share \| $ / shares		$ 104.20
Alabama Power [Member] \| 4.52% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.0452
Par Value/Stated Capital Per Share \| $ / shares		$ 100
Temporary Equity, Shares Outstanding \| shares		50,000
Redemption Price Per Share \| $ / shares		$ 102.93
Alabama Power [Member] \| 4.20% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.0420
Par Value/Stated Capital Per Share \| $ / shares		$ 100
Temporary Equity, Shares Outstanding \| shares		135,115
Redemption Price Per Share \| $ / shares		$ 105.00
Alabama Power [Member] \| 5.83% Class A Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.0583
Par Value/Stated Capital Per Share \| $ / shares		$ 25
Temporary Equity, Shares Outstanding \| shares		1,520,000
Alabama Power [Member] \| 6.450% Preference Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.06450
Par Value/Stated Capital Per Share \| $ / shares		$ 25
Temporary Equity, Shares Outstanding \| shares		6,000,000
Alabama Power [Member] \| 6.500% Preference Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage		0.06500
Par Value/Stated Capital Per Share \| $ / shares		$ 25
Temporary Equity, Shares Outstanding \| shares		2,000,000
Alabama Power [Member] \| 5.20% Class A Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage	0.052	0.0520
Par Value/Stated Capital Per Share \| $ / shares	$ 25
Temporary Equity, Shares Outstanding \| shares	6,480,000
Alabama Power [Member] \| 5.30% Class A Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage	0.053	0.0530
Temporary Equity, Shares Outstanding \| shares	4,000,000
Alabama Power [Member] \| 5.625% Preference Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Redeemable Preferred Stock/Preference Stock dividend rate percentage	0.05625	0.05625
Temporary Equity, Shares Outstanding \| shares	6,000,000
Mississippi Power [Member]
Debt Disclosure [Line Items]
Long-term debt affiliated		$ 551		0
2019		$ 125		$ 125
Redeemable Preferred/Preference Stock [Abstract]
Temporary Equity, Shares Outstanding \| shares		334,210		334,210
Scheduled maturities and redemptions of securities due within one year
Senior notes		$ 35		$ 300
Other long-term debt		63
Pollution control revenue bonds		40		0
Capitalized leases		3		3
Bank term loans		0		425
Total		629		728
Total		$ 35		$ 35
Mississippi Power [Member] \| 4.40% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Par Value/Stated Capital Per Share \| $ / shares		$ 100,000,000
Temporary Equity, Shares Outstanding \| shares		8,867,000,000
Redemption Price Per Share \| $ / shares		$ 104.32
Mississippi Power [Member] \| 4.72% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Par Value/Stated Capital Per Share \| $ / shares		$ 100,000,000
Temporary Equity, Shares Outstanding \| shares		16,700,000,000
Redemption Price Per Share \| $ / shares		$ 102.25
Mississippi Power [Member] \| 4.60% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Par Value/Stated Capital Per Share \| $ / shares		$ 100,000,000
Temporary Equity, Shares Outstanding \| shares		8,643,000,000
Redemption Price Per Share \| $ / shares		$ 107.00
Mississippi Power [Member] \| 5.25% Redeemable Preferred Stock [Member]
Redeemable Preferred/Preference Stock [Abstract]
Par Value/Stated Capital Per Share \| $ / shares		$ 100,000,000
Temporary Equity, Shares Outstanding \| shares		300,000,000,000
Redemption Price Per Share \| $ / shares		$ 100.00
Unsecured Debt [Member] \| Alabama Power [Member]
Debt Disclosure [Line Items]
Redemption Amount of Principal Notes			$ 200