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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total Assets	$ 237,428	$ 253,863
Goodwill	4,463	4,518
United States
Segment Reporting Information [Line Items]
Total Assets	64,598	71,560
International
Segment Reporting Information [Line Items]
Total Assets	168,367	177,785
Operating Segments
Segment Reporting Information [Line Items]
Total Assets	228,189	240,461
Operating Segments | Upstream
Segment Reporting Information [Line Items]
Total Assets	186,037	200,973
Goodwill	4,463	4,518
Operating Segments | Upstream | United States
Segment Reporting Information [Line Items]
Total Assets	35,926	42,594
Operating Segments | Upstream | International
Segment Reporting Information [Line Items]
Total Assets	145,648	153,861
Operating Segments | Downstream
Segment Reporting Information [Line Items]
Total Assets	42,152	39,488
Operating Segments | Downstream | United States
Segment Reporting Information [Line Items]
Total Assets	25,197	23,866
Operating Segments | Downstream | International
Segment Reporting Information [Line Items]
Total Assets	16,955	15,622
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total Assets	9,239	13,402
Segment Reconciling Items | United States
Segment Reporting Information [Line Items]
Total Assets	3,475	5,100
Segment Reconciling Items | International
Segment Reporting Information [Line Items]
Total Assets	$ 5,764	$ 8,302

X

- 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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