Other Financial Information - Other Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and Debt Expense
Debt	$ 824	$ 791	$ 887
Other	109	72	59
Interest costs incurred	933	863	946
Capitalized	(153)	(58)	(62)
Expensed	780	805	884
Other Income
Interest income	412	195	33
Gain (loss) on investment in Cenovus Energy	0	251	1,040
Other, net	73	58	130
Other nonoperating income (expense)	485	504	1,203
Research and Development Expenditures—expensed	81	71	62
Shipping and Handling Costs	7,693	7,006	5,694
Foreign Currency Transaction (Gains) Losses—after-tax	70	(80)	(16)
Operating Segments | Alaska
Other Income
Interest income	0	0	0
Foreign Currency Transaction (Gains) Losses—after-tax	0	0	0
Operating Segments | Lower 48
Other Income
Foreign Currency Transaction (Gains) Losses—after-tax	0	0	0
Operating Segments | Canada
Other Income
Foreign Currency Transaction (Gains) Losses—after-tax	11	(20)	(1)
Operating Segments | Europe, Middle East and North Africa
Other Income
Interest income	1	1	2
Foreign Currency Transaction (Gains) Losses—after-tax	(39)	(110)	(11)
Operating Segments | Asia Pacific
Other Income
Interest income	8	9	9
Foreign Currency Transaction (Gains) Losses—after-tax	12	30	2
Operating Segments | Other International
Other Income
Interest income	0	0	0
Foreign Currency Transaction (Gains) Losses—after-tax	0	(1)	1
Corporate and Other
Interest and Debt Expense
Expensed	780	805	884
Other Income
Interest income	403	185	22
Foreign Currency Transaction (Gains) Losses—after-tax	86	21	(7)
Shipping and Handling Costs
Other Income
Shipping and Handling Costs	$ 1,695	$ 1,595	$ 1,047