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Segment Disclosures and Related Information - Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 7,953	$ 8,504	$ 17,103	$ 17,302
Natural Gas [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,915	2,294	4,918	5,090
Natural Gas Liquids Reserves [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	213	265	451	496
Crude Oil [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	4,813	4,776	9,394	9,226
Other Products [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,012	1,169	2,340	2,490
U.S.
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,225	5,256	10,911	10,592
Australia
Segment Reporting Information [Line Items]
Sales and other operating revenues	311	303	870	743
Canada
Segment Reporting Information [Line Items]
Sales and other operating revenues	382	520	955	1,156
China
Segment Reporting Information [Line Items]
Sales and other operating revenues	159	136	402	354
Indonesia
Segment Reporting Information [Line Items]
Sales and other operating revenues	226	213	431	428
Malaysia
Segment Reporting Information [Line Items]
Sales and other operating revenues	334	356	670	700
Norway
Segment Reporting Information [Line Items]
Sales and other operating revenues	561	715	1,149	1,378
United Kingdom
Segment Reporting Information [Line Items]
Sales and other operating revenues	485	668	1,189	1,337
Libya [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	267	262	521	538
Other Non US Countries
Segment Reporting Information [Line Items]
Sales and other operating revenues	3	75	5	76
Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	7,953	8,504	17,103	17,302
Alaska [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,426	1,403	2,833	2,788
Lower 48 [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	3,809	3,852	7,962	7,804
Lower 48 [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	3,798	3,851	7,939	7,800
Lower 48 [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	(11)	(1)	(23)	(4)
Canada
Segment Reporting Information [Line Items]
Sales and other operating revenues	717	810	1,540	1,701
Canada | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	382	520	955	1,156
Canada | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	(335)	(290)	(585)	(545)
Europe and North Africa [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,313	1,644	2,859	3,252
Asia Pacific and Middle East [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,030	1,006	2,373	2,222
Corporate and Other [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 4	$ 80	$ 144	$ 84

X

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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