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Acquisitions, Development and Divestitures - Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Loss from Discontinued Operations (net of income taxes) $ 0 $ (2,043)  
Discontinued Operations, Held-for-sale | WPD      
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]      
Sales proceeds, net of realized foreign currency hedge losses     $ 10,700
Loss on Sale   (1,647)  
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Operating Revenues   634  
Operating Expenses   252  
Other Income (Expense) - net   66  
Interest Expense   93  
Income before income taxes   355  
Gain (Loss) on Sale   (1,647)  
Income tax expense   751  
Loss from Discontinued Operations (net of income taxes)   (2,043)  
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]      
Gain (Loss) on Sale   $ (1,647)  
Net Proceeds From Divestiture Of Businesses     $ 10,400