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Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total Assets	$ 253,806	$ 260,078
Goodwill	4,531	4,581
United States
Segment Reporting Information [Line Items]
Total Assets	68,910	69,712
International
Segment Reporting Information [Line Items]
Total Assets	180,365	185,785
Operating Segments
Segment Reporting Information [Line Items]
Total Assets	245,549	249,325
Operating Segments | Upstream
Segment Reporting Information [Line Items]
Total Assets	204,913	211,245
Goodwill	4,531	4,581
Operating Segments | Upstream | United States
Segment Reporting Information [Line Items]
Total Assets	40,770	42,596
Operating Segments | Upstream | International
Segment Reporting Information [Line Items]
Total Assets	159,612	164,068
Operating Segments | Downstream
Segment Reporting Information [Line Items]
Total Assets	40,636	38,080
Operating Segments | Downstream | United States
Segment Reporting Information [Line Items]
Total Assets	23,202	22,264
Operating Segments | Downstream | International
Segment Reporting Information [Line Items]
Total Assets	17,434	15,816
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total Assets	8,257	10,753
Segment Reconciling Items | United States
Segment Reporting Information [Line Items]
Total Assets	4,938	4,852
Segment Reconciling Items | International
Segment Reporting Information [Line Items]
Total Assets	$ 3,319	$ 5,901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
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