Segment Disclosures and Related Information (Sales and Other Operating Revenues by Product) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 45,828	$ 18,784	$ 32,567
Natural Gas [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	16,904	6,427	8,715
Natural Gas Liquids Reserves [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,668	528	814
Crude Oil [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	23,648	9,736	18,482
Other Products [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 3,608	$ 2,093	$ 4,556