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v3.25.0.1

LEASES - Leveraged Leases (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2024 leveragedLease
Leases [Abstract] |
Number of leveraged leases | 1
Remaining lease term | 7 years

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- Definition Leveraged Leases, Remaining Lease Term + References No definition available. + Details
Name: | so_LeveragedLeasesRemainingLeaseTerm
Namespace Prefix: | so_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Leveraged Leases + References No definition available. + Details
Name: | so_NumberOfLeveragedLeases
Namespace Prefix: | so_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration