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Consolidated Entities and Equity Method Investments (Tables)
9 Months Ended
Sep. 30, 2025
Regulated Operations [Abstract]  
Schedule of Equity Method Investments
The carrying amounts of Southern Company Gas' equity method investments at September 30, 2025 and December 31, 2024 were as follows:
Investment BalanceAt September 30, 2025At December 31, 2024
(in millions)
SNG$1,141 $1,245 
Other34 34 
Total$1,175 $1,279