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ACQUISITIONS AND DISPOSITIONS - Schedule of Asset Acquisitions (Details) - South Cheyenne Solar Facility - Southern Power | 12 Months Ended
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Dec. 31, 2024 MW
Asset Acquisition [Line Items] |
Approximate Nameplate Capacity (MW) | 150
PPA Contract Period | 20 years

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- Definition Approximate Nameplate Capacity + References No definition available. + Details
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Namespace Prefix: | so_
Data Type: | dtr-types1:powerItemType
Balance Type: | na
Period Type: | duration

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- Definition The contracted life output of the plant. + References No definition available. + Details
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Namespace Prefix: | so_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 15 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480123/805-50-15-3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_OwnershipAxis=so_SouthCheyenneSolarFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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