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Fair Value Measurements - Schedule of Financial Instruments for which Carrying Amount did not Equal Fair Value (Details) $ in Billions	Jun. 30, 2024 USD ($)
Long-term debt, including securities due within one year:
Carrying amount	$ 62.4
Fair value	56.7
ALABAMA POWER CO
Long-term debt, including securities due within one year:
Carrying amount	11.2
Fair value	9.7
GEORGIA POWER CO
Long-term debt, including securities due within one year:
Carrying amount	17.8
Fair value	16.0
MISSISSIPPI POWER CO
Long-term debt, including securities due within one year:
Carrying amount	1.7
Fair value	1.5
SOUTHERN POWER CO
Long-term debt, including securities due within one year:
Carrying amount	2.7
Fair value	2.5
SOUTHERN Co GAS
Long-term debt, including securities due within one year:
Carrying amount	7.8
Fair value	$ 6.6

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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- References

No definition available.

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- Details

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- Details

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- Details

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