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Introduction (Tables)
 3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Goodwill
Goodwill at both March 31, 2026 and December 31, 2025 was as follows:
Goodwill
(in millions)
Southern Company$5,161 
Southern Company Gas:
Gas distribution operations$4,034 
Gas marketing services981 
Southern Company Gas total$5,015 
Schedule of Other Intangible Assets, Indefinite-Lived
Other intangible assets were as follows:
At March 31, 2026At December 31, 2025
Gross
Carrying
Amount		Accumulated
Amortization		Other
Intangible
Assets,
Net		Gross
Carrying
Amount		Accumulated
Amortization		Other
Intangible
Assets,
Net
(in millions)(in millions)
Southern Company
Subject to amortization:
Customer relationships$212 $(190)$22 $212 $(189)$23 
Trade names64 (64)— 64 (64)— 
PPA fair value adjustments390 (193)197 390 (188)202 
Other3 (3)— 3 (3)— 
Total subject to amortization$669 $(450)$219 $669 $(444)$225 
Not subject to amortization:
FCC licenses75 — 75 75 — 75 
Total other intangible assets$744 $(450)$294 $744 $(444)$300 
Southern Power(*)
PPA fair value adjustments$390 $(193)$197 $390 $(188)$202 
Southern Company Gas(*)
Gas marketing services
Customer relationships$156 $(154)$2 $156 $(153)$3 
Trade names26 (26)— 26 (26)— 
Total other intangible assets$182 $(180)$2 $182 $(179)$3 
(*)All subject to amortization.
Schedule of Other Intangible Assets, Finite-Lived
Other intangible assets were as follows:
At March 31, 2026At December 31, 2025
Gross
Carrying
Amount		Accumulated
Amortization		Other
Intangible
Assets,
Net		Gross
Carrying
Amount		Accumulated
Amortization		Other
Intangible
Assets,
Net
(in millions)(in millions)
Southern Company
Subject to amortization:
Customer relationships$212 $(190)$22 $212 $(189)$23 
Trade names64 (64)— 64 (64)— 
PPA fair value adjustments390 (193)197 390 (188)202 
Other3 (3)— 3 (3)— 
Total subject to amortization$669 $(450)$219 $669 $(444)$225 
Not subject to amortization:
FCC licenses75 — 75 75 — 75 
Total other intangible assets$744 $(450)$294 $744 $(444)$300 
Southern Power(*)
PPA fair value adjustments$390 $(193)$197 $390 $(188)$202 
Southern Company Gas(*)
Gas marketing services
Customer relationships$156 $(154)$2 $156 $(153)$3 
Trade names26 (26)— 26 (26)— 
Total other intangible assets$182 $(180)$2 $182 $(179)$3 
(*)All subject to amortization.
Schedule of Amortization of Other Intangible Assets
Amortization associated with other intangible assets was as follows:
Three Months Ended March 31,
20262025
(in millions)
Southern Company(a)
$7 $8 
Southern Power(b)
5 5 
Southern Company Gas
Gas marketing services1 2 
(a)Includes $5 million for the three months ended March 31, 2026 and 2025 recorded as a reduction to operating revenues.
(b)Recorded as a reduction to operating revenues.
Schedule of Restrictions on Cash and Cash Equivalents
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed balance sheets that total to the amount shown in the condensed statements of cash flows for the applicable Registrants:
Southern CompanySouthern
Company Gas
(in millions)
At March 31, 2026
Cash and cash equivalents$981 $137 
Restricted cash(*):
Other current assets
6 5 
Total cash, cash equivalents, and restricted cash
$987 $142 
At December 31, 2025
Cash and cash equivalents$1,639 $15 
Restricted cash(*):
Other current assets
1 — 
Total cash, cash equivalents, and restricted cash
$1,640 $15 
(*)For Southern Company Gas, reflects funds held to support letters of credit. For Southern Company, also reflects collateral of $1 million for life insurance and long-term disability insurance, which was included at Southern Holdings.
Schedule of Cash and Cash Equivalents
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed balance sheets that total to the amount shown in the condensed statements of cash flows for the applicable Registrants:
Southern CompanySouthern
Company Gas
(in millions)
At March 31, 2026
Cash and cash equivalents$981 $137 
Restricted cash(*):
Other current assets
6 5 
Total cash, cash equivalents, and restricted cash
$987 $142 
At December 31, 2025
Cash and cash equivalents$1,639 $15 
Restricted cash(*):
Other current assets
1 — 
Total cash, cash equivalents, and restricted cash
$1,640 $15 
(*)For Southern Company Gas, reflects funds held to support letters of credit. For Southern Company, also reflects collateral of $1 million for life insurance and long-term disability insurance, which was included at Southern Holdings.