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CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]  
Equity method investments
The carrying amounts of Southern Company Gas' equity method investments at December 31, 2023 and 2022 and related earnings (loss) from those investments for the years ended December 31, 2023, 2022, and 2021 were as follows:
Investment BalanceDecember 31, 2023
December 31, 2022
(in millions)
SNG$1,202 $1,243 
Other
33 33 
Total$1,235 $1,276 
Equity method investments related income
Earnings (Loss) from Equity Method Investments202320222021
(in millions)
SNG$139 $146 $127 
PennEast Pipeline(*)
— — (81)
Other1 2 4 
Total$140 $148 $50 
(*)For 2021, includes pre-tax impairment charges totaling $84 million. See "PennEast Pipeline Project" herein for additional information, including the September 2021 cancellation of the project.