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LEASES - Major Categories of Lease Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
Lease obligations | $ 1,740 | $ 1,788
Alabama Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 94 | 98
Georgia Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 1,589 | 1,115
Mississippi Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 22 | 25
Southern Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 540 | 546
Southern Company Gas |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 41 | 51
Electric generating units(*) |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 672 | 670
Electric generating units(*) | Alabama Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 56 | 58
Electric generating units(*) | Georgia Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 1,509 | 1,028
Electric generating units(*) | Mississippi Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Electric generating units(*) | Southern Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Electric generating units(*) | Southern Company Gas |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Real estate/land |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 834 | 871
Real estate/land | Alabama Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 3 | 4
Real estate/land | Georgia Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 45 | 54
Real estate/land | Mississippi Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 2 | 2
Real estate/land | Southern Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 540 | 546
Real estate/land | Southern Company Gas |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 20 | 28
Communication towers |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 118 | 123
Communication towers | Alabama Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 2 | 1
Communication towers | Georgia Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 4 | 4
Communication towers | Mississippi Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Communication towers | Southern Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Communication towers | Southern Company Gas |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 21 | 23
Railcars |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 64 | 64
Railcars | Alabama Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 31 | 32
Railcars | Georgia Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 29 | 27
Railcars | Mississippi Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 4 | 5
Railcars | Southern Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Railcars | Southern Company Gas |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Other |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 52 | 60
Other | Alabama Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 2 | 3
Other | Georgia Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 2 | 2
Other | Mississippi Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 16 | 18
Other | Southern Power |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | 0 | 0
Other | Southern Company Gas |  |
Lessee, Lease, Description [Line Items] |  |
Lease obligations | $ 0 | $ 0

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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/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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