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Consolidated Statements of Income (Parenthetical) - Southern Company Gas - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Excise taxes collected $ 32   $ 114 $ 100
Predecessor        
Excise taxes collected   $ 57