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Acquisitions and Dispositions - Southern Company Gas Narrative (Details) - SOUTHERN Co GAS - Disposal Group, Disposed of by Sale
$ in Millions
Aug. 31, 2021
USD ($)
Apr. 28, 2021
USD ($)
Apr. 22, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
payment
Pivotal LNG          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of contingent milestone payments | payment         2
Sequent          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net book value excluding working capital       $ 46  
Guarantor obligations, current carrying value       279  
Guarantor obligations       $ 1,000  
Sequent | Subsequent Event          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Sale price   $ 50      
Scenario, Forecast | Pivotal LNG          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Contingent milestone payment, amount $ 5   $ 5