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Acquisitions and Dispositions - Direct Energy Contributed Revenue and Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Revenues	$ 6,609	$ 2,809	$ 19,943	$ 7,066
Income before income taxes	2,163	$ 341	3,454	$ 899
Direct Energy
Business Acquisition [Line Items]
Revenues	3,599		10,718
Income before income taxes	$ 2,010		$ 3,457

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