XML 158 R116.htm IDEA: XBRL DOCUMENT
v3.24.0.1

REGULATORY MATTERS - GPC Tariffs (Details) - Georgia Power $ in Millions | Dec. 31, 2022 USD ($)
--- | ---
Public Utilities, General Disclosures [Line Items] |
Requested rate increase (decrease), amount, due in next fiscal year | $ 216
Requested rate increase (decrease), amount, due in 2024 | 191
Requested rate increase (decrease), amount, due in 2025 | 157
Traditional base |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase (decrease), amount, due in next fiscal year | 194
Requested rate increase (decrease), amount, due in 2024 | 275
Requested rate increase (decrease), amount, due in 2025 | 192
ECCR |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase (decrease), amount, due in next fiscal year | (21)
Requested rate increase (decrease), amount, due in 2024 | (99)
Requested rate increase (decrease), amount, due in 2025 | (12)
DSM |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase (decrease), amount, due in next fiscal year | 37
Requested rate increase (decrease), amount, due in 2024 | 10
Requested rate increase (decrease), amount, due in 2025 | (25)
MFF |
Public Utilities, General Disclosures [Line Items] |
Requested rate increase (decrease), amount, due in next fiscal year | 6
Requested rate increase (decrease), amount, due in 2024 | 5
Requested rate increase (decrease), amount, due in 2025 | $ 2

X
- Definition Public Utilities, Requested Rate Increase (Decrease), Amount, Due In Next Fiscal Year + References No definition available. + Details
Name: | so_PublicUtilitiesRequestedRateIncreaseDecreaseAmountDueInNextFiscalYear
Namespace Prefix: | so_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Requested Rate Increase (Decrease), Amount, Due In Second Year + References No definition available. + Details
Name: | so_PublicUtilitiesRequestedRateIncreaseDecreaseAmountDueInSecondYear
Namespace Prefix: | so_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Requested Rate Increase (Decrease), Amount, Due In Third Year + References No definition available. + Details
Name: | so_PublicUtilitiesRequestedRateIncreaseDecreaseAmountDueInThirdYear
Namespace Prefix: | so_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=so_TraditionalBaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=so_EnvironmentalComplianceCostRecoveryTraditionalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=so_DemandSideManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=so_MunicipalFranchiseFeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |