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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets	$ 239,790	$ 237,428
Goodwill	4,402	4,463
United States
Segment Reporting Information [Line Items]
Total Assets	69,938	64,598
International
Segment Reporting Information [Line Items]
Total Assets	165,450	168,367
Operating Segments
Segment Reporting Information [Line Items]
Total Assets	230,895	228,189
Operating Segments | Upstream
Segment Reporting Information [Line Items]
Total Assets	191,309	186,037
Goodwill	4,402	4,463
Operating Segments | Upstream | United States
Segment Reporting Information [Line Items]
Total Assets	42,431	35,926
Operating Segments | Upstream | International
Segment Reporting Information [Line Items]
Total Assets	144,476	145,648
Operating Segments | Downstream
Segment Reporting Information [Line Items]
Total Assets	39,586	42,152
Operating Segments | Downstream | United States
Segment Reporting Information [Line Items]
Total Assets	23,490	25,197
Operating Segments | Downstream | International
Segment Reporting Information [Line Items]
Total Assets	16,096	16,955
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total Assets	8,895	9,239
Segment Reconciling Items | United States
Segment Reporting Information [Line Items]
Total Assets	4,017	3,475
Segment Reconciling Items | International
Segment Reporting Information [Line Items]
Total Assets	$ 4,878	$ 5,764

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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