Acquisitions, Development and Divestitures - Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income (Loss) from Discontinued Operations (net of income taxes)	$ 0	$ (2)		$ 0	$ (1,490)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Total Assets	325			325		$ 0
Total Liabilities	$ 205			$ 205		$ 0
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		0			(1,609)
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Operating Revenues		0			1,344
Operating Expenses		0			466
Other Income (Expense) - net		0			202
Interest Expense		0			209
Income before income taxes		0			871
Gain (Loss) on Sale		0			(1,609)
Income tax expense		2			752
Income (Loss) from Discontinued Operations (net of income taxes)		(2)			(1,490)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Gain (Loss) on Sale		$ 0			$ (1,609)
Net Proceeds From Divestiture Of Businesses			$ 10,400