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Acquisitions, Development and Divestitures - Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Income (Loss) from Discontinued Operations (net of income taxes) $ 555 $ 0 $ (1,488)
Discontinued Operations, Disposed of by 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 38   (1,609)
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Operating Revenues 710   1,344
Operating Expenses 214   466
Other Income (Expense) - net 136   202
Interest Expense 116   209
Income before income taxes 516   871
Gain (Loss) on Sale 38   (1,609)
Income tax expense (1)   750
Income (Loss) from Discontinued Operations (net of income taxes) 555   (1,488)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]      
Gain (Loss) on Sale $ 38   (1,609)
Net Proceeds From Divestiture Of Businesses     $ 10,400