Segment Disclosures and Related Information (Depreciation, Depletion, Amortization and Impairments, Equity in Earnings of Affiliates and Income Tax Provision (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	$ 7,882	$ 6,334	$ 6,495
Equity in earnings of affiliates	832	432	779
Income tax provision (benefit)	4,633	(485)	2,267
Alaska [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	1,002	996	805
Equity in earnings of affiliates	5	(7)	7
Income tax provision (benefit)	402	(256)	472
Lower 48 [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	4,067	3,358	3,224
Equity in earnings of affiliates	(18)	(11)	(159)
Income tax provision (benefit)	1,390	(378)	137
Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	392	342	232
Equity in earnings of affiliates	0	0	0
Income tax provision (benefit)	150	(185)	(43)
Europe, Middle East and North Africa [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	862	775	887
Equity in earnings of affiliates	502	311	470
Income tax provision (benefit)	2,543	136	1,425
Asia Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	1,483	809	1,285
Equity in earnings of affiliates	343	137	461
Income tax provision (benefit)	483	294	501
Other International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	0	0	0
Equity in earnings of affiliates	0	2	0
Income tax provision (benefit)	(53)	(20)	8
Corporate and Other [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairments	76	54	62
Equity in earnings of affiliates	0	0	0
Income tax provision (benefit)	$ (282)	$ (76)	$ (233)