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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total Assets	$ 253,863	$ 253,806
Goodwill	4,518	4,531
United States
Segment Reporting Information [Line Items]
Total Assets	71,560	68,910
International
Segment Reporting Information [Line Items]
Total Assets	177,785	180,365
Operating Segments
Segment Reporting Information [Line Items]
Total Assets	240,461	245,549
Operating Segments | Upstream
Segment Reporting Information [Line Items]
Total Assets	200,973	204,913
Goodwill	4,518	4,531
Operating Segments | Upstream | United States
Segment Reporting Information [Line Items]
Total Assets	42,594	40,770
Operating Segments | Upstream | International
Segment Reporting Information [Line Items]
Total Assets	153,861	159,612
Operating Segments | Downstream
Segment Reporting Information [Line Items]
Total Assets	39,488	40,636
Operating Segments | Downstream | United States
Segment Reporting Information [Line Items]
Total Assets	23,866	23,202
Operating Segments | Downstream | International
Segment Reporting Information [Line Items]
Total Assets	15,622	17,434
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total Assets	13,402	8,257
Segment Reconciling Items | United States
Segment Reporting Information [Line Items]
Total Assets	5,100	4,938
Segment Reconciling Items | International
Segment Reporting Information [Line Items]
Total Assets	$ 8,302	$ 3,319

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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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