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Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Segment Assets
Segment Assets	$ 256,442	$ 253,806
Goodwill	4,531	4,531
United States
Segment Assets
Segment Assets	71,335	68,910
International
Segment Assets
Segment Assets	180,576	180,365
Operating Segments
Segment Assets
Segment Assets	246,455	245,549
Operating Segments | Upstream
Segment Assets
Segment Assets	205,393	204,913
Goodwill	4,531	4,531
Operating Segments | Upstream | United States
Segment Assets
Segment Assets	41,791	40,770
Operating Segments | Upstream | International
Segment Assets
Segment Assets	159,071	159,612
Operating Segments | Downstream
Segment Assets
Segment Assets	41,062	40,636
Operating Segments | Downstream | United States
Segment Assets
Segment Assets	23,862	23,202
Operating Segments | Downstream | International
Segment Assets
Segment Assets	17,200	17,434
All Other
Segment Assets
Segment Assets	9,987	8,257
All Other | United States
Segment Assets
Segment Assets	5,682	4,938
All Other | International
Segment Assets
Segment Assets	$ 4,305	$ 3,319

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.

+ 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))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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-Name Accounting Standards Codification
-Topic 350
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