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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value
At June 30, 2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
Fair Value Measurements Using:
At June 30, 2023Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Net Asset Value as a Practical Expedient (NAV)Total
(in millions)
Southern Company
Assets:
Energy-related derivatives(a)
$7 $86 $— $— $93 
Interest rate derivatives— 4 — — 4 
Investments in trusts:(b)(c)
Domestic equity718 205 — — 923 
Foreign equity140 167 — — 307 
U.S. Treasury and government agency securities— 333 — — 333 
Municipal bonds— 46 — — 46 
Pooled funds – fixed income— 7 — — 7 
Corporate bonds— 391 — — 391 
Mortgage and asset backed securities — 90 — — 90 
Private equity— — — 166 166 
Cash and cash equivalents2 — — — 2 
Other31 7 — 9 47 
Cash equivalents1,494 12 — — 1,506 
Other investments9 34 8 — 51 
Total$2,401 $1,382 $8 $175 $3,966 
Liabilities:
Energy-related derivatives(a)
$33 $278 $— $— $311 
Interest rate derivatives— 304 — — 304 
Foreign currency derivatives— 170 — — 170 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$33 $765 $12 $— $810 
Fair Value Measurements Using:
At June 30, 2023Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Net Asset Value as a Practical Expedient (NAV)Total
(in millions)
Alabama Power
Assets:
Energy-related derivatives$— $32 $— $— $32 
Nuclear decommissioning trusts:(b)
Domestic equity420 198 — — 618 
Foreign equity140 — — — 140 
U.S. Treasury and government agency securities— 20 — — 20 
Municipal bonds— 1 — — 1 
Corporate bonds— 221 — — 221 
Mortgage and asset backed securities— 21 — — 21 
Private equity— — — 166 166 
Other7 — — 9 16 
Cash equivalents110 12 — — 122 
Other investments— 34 — — 34 
Total$677 $539 $— $175 $1,391 
Liabilities:
Energy-related derivatives$— $84 $— $— $84 
Georgia Power
Assets:
Energy-related derivatives$— $17 $— $— $17 
Nuclear decommissioning trusts:(b)(c)
Domestic equity298 1 — — 299 
Foreign equity166 — — 166 
U.S. Treasury and government agency securities— 313 — — 313 
Municipal bonds— 45 — — 45 
Corporate bonds— 170 — — 170 
Mortgage and asset backed securities— 69 — — 69 
Other24 7 — — 31 
Total$322 $788 $— $— $1,110 
Liabilities:
Energy-related derivatives$— $102 $— $— $102 
Fair Value Measurements Using:
At June 30, 2023Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Net Asset Value as a Practical Expedient (NAV)Total
(in millions)
Mississippi Power
Assets:
Energy-related derivatives$— $27 $— $— $27 
Liabilities:
Energy-related derivatives$— $55 $— $— $55 
Southern Power
Assets:
Energy-related derivatives$— $4 $— $— $4 
Cash equivalents5 — — — 5 
Total$5 $4 $— $— $9 
Liabilities:
Energy-related derivatives$— $10 $— $— $10 
Foreign currency derivatives— 28 — — 28 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$— $51 $12 $— $63 
Southern Company Gas
Assets:
Energy-related derivatives(a)
$7 $6 $— $— $13 
Interest rate derivatives— 4 — — 4 
Non-qualified deferred compensation trusts:
Domestic equity— 6 — — 6 
Foreign equity— 1 — — 1 
Pooled funds – fixed income— 7 — — 7 
Cash equivalents2 — — — 2 
Cash equivalents and restricted cash215 — — — 215 
Total$224 $24 $— $— $248 
Liabilities:
Energy-related derivatives(a)
$33 $27 $— $— $60 
Interest rate derivatives— 88 — — 88 
Total$33 $115 $— $— $148 
(a)Excludes cash collateral of $52 million.
(b)Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information.
(c)Includes investment securities pledged to creditors and collateral received and excludes payables related to the securities lending program. At June 30, 2023, approximately $25 million of the fair market value of Georgia Power's nuclear decommissioning trust funds' securities were on loan to creditors under the funds' managers' securities lending program. See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information.
Schedule of Increase (Decrease) In Fair Value Of Funds The fair value of the funds, including reinvested interest and dividends and excluding the funds' expenses, increased (decreased) by the amounts shown in the table below for the three and six months ended June 30, 2023 and 2022. The changes were recorded as a change to the regulatory assets and liabilities related to AROs for Georgia Power and Alabama Power, respectively.
Three Months Ended
Six Months Ended
Fair value increases (decreases)June 30, 2023June 30, 2022June 30, 2023June 30, 2022
(in millions)
Southern Company $132 $(230)$228 $(380)
Alabama Power 58 (125)103 (192)
Georgia Power74 (105)125 (188)
Schedule of Financial Instruments for which Carrying Amount Did Not Equal Fair Value
At June 30, 2023, other financial instruments for which the carrying amount did not equal fair value were as follows:
Southern
Company		Alabama PowerGeorgia PowerMississippi PowerSouthern Power
Southern Company Gas(*)
(in billions)
Long-term debt, including securities due within one year:
Carrying amount$58.9 $10.8 $16.5 $1.6 $3.0 $7.5 
Fair value53.5 9.5 15.0 1.4 2.8 6.6 
(*)The long-term debt of Southern Company Gas is recorded at amortized cost, including the fair value adjustments at the effective date of the 2016 merger with Southern Company. Southern Company Gas amortizes the fair value adjustments over the remaining lives of the respective bonds, the latest being through 2043.