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Disclosures About Segments And Related Information (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Segment Reporting Information [Line Items]

Earnings after income tax

$ 3,970

$ 2,650

$ 11,330

$ 6,160

Sales and other operating revenue

^[1],[2]

64,415

56,767

186,330

160,232

Upstream United States [Member]

Segment Reporting Information [Line Items]

Earnings after income tax

(238)

(477)

(439)

(1,823)

Sales and other operating revenue

^[1]

2,282

2,152

6,955

5,373

Intersegment Revenue

1,365

875

3,937

2,598

Upstream Non-U.S. [Member]

Segment Reporting Information [Line Items]

Earnings after income tax

1,805

1,097

5,442

2,661

Sales and other operating revenue

^[1]

3,736

3,177

10,865

9,371

Intersegment Revenue

5,734

4,401

16,356

12,843

Downstream United States [Member]

Segment Reporting Information [Line Items]

Earnings after income tax

391

225

1,030

824

Sales and other operating revenue

^[1]

16,312

14,930

47,059

40,981

Intersegment Revenue

3,134

2,775

10,621

8,057

Downstream Non-U.S. [Member]

Segment Reporting Information [Line Items]

Earnings after income tax

1,141

1,004

3,003

2,136

Sales and other operating revenue

^[1]

34,837

29,969

99,978

85,135

Intersegment Revenue

5,866

4,903

16,048

13,514

Chemical United States [Member]

Segment Reporting Information [Line Items]

Earnings after income tax

403

434

1,413

1,524

Sales and other operating revenue

^[1]

2,589

2,474

8,119

7,377

Intersegment Revenue

1,675

1,615

5,290

4,805

Chemical Non-U.S. [Member]

Segment Reporting Information [Line Items]

Earnings after income tax

689

737

1,835

2,219

Sales and other operating revenue

^[1]

4,646

4,049

13,313

11,970

Intersegment Revenue

1,482

1,043

3,776

3,073

All Other [Member]

Segment Reporting Information [Line Items]

Earnings after income tax

(221)

(370)

(954)

(1,381)

Sales and other operating revenue

^[1]

13

16

41

25

Intersegment Revenue

$ 51

$ 60

$ 154

$ 174

[1]	Includes sales-based taxes
[2]	Sales-based taxes included in sales and other operating revenue for the three months ended September 30, 2017, and 2016, were $5,864 million and $5,437 million, respectively, and for the nine months ended September 30, 2017, and 2016, were $16,795 million and $15,687 million, respectively.

X

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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