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Acquisitions and Dispositions - Southern Company Gas Narrative (Details) - SOUTHERN Co GAS - Disposal Group, Disposed of by Sale
$ in Millions
Jul. 01, 2021
USD ($)
Feb. 28, 2022
USD ($)
Jun. 30, 2021
USD ($)
Apr. 22, 2021
USD ($)
Mar. 31, 2020
payment
Sequent          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Guarantor obligations, current carrying value     $ 268    
Guarantor obligations     $ 1,000    
Sequent | Subsequent Event          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Sale price $ 150        
Gain on sale $ 90        
Pivotal LNG          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of contingent milestone payments | payment         2
Contingent milestone payment, amount       $ 5  
Scenario, Forecast | Pivotal LNG          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Contingent milestone payment, amount   $ 5