Segment Disclosures and Related Information (Sales and Other Operating Revenues) (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
Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	45,828	18,784	32,567
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	75	18	221
Alaska [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,480	3,408	5,483
Alaska [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,480	3,397	5,483
Alaska [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	(11)	0
Lower 48 [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	29,306	9,872	15,514
Lower 48 [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	29,294	9,821	15,468
Lower 48 [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	(12)	(51)	(46)
Canada [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	4,077	1,666	2,910
Canada [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	2,494	1,261	1,769
Canada [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	(1,583)	(405)	(1,141)
Europe, Middle East and North Africa [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,902	1,919	5,101
Europe, Middle East and North Africa [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,902	1,917	5,101
Europe, Middle East and North Africa [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	(2)	0
Asia Pacific [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	2,579	2,363	4,525
Other International [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 4	$ 7	$ 0