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Segment Disclosures and Related Information - Sales (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 9,449,000,000	$ 6,688,000,000	$ 26,751,000,000	$ 20,987,000,000
Natural Gas [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		2,503,000,000	2,496,000,000	7,593,000,000	7,949,000,000
Natural Gas Liquids Reserves [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		351,000,000	238,000,000	847,000,000	745,000,000
Crude Oil [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		5,277,000,000	2,947,000,000	14,503,000,000	9,387,000,000
Other Products [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,318,000,000	1,007,000,000	3,808,000,000	2,906,000,000
U.S.
Segment Reporting Information [Line Items]
Sales and other operating revenues		6,025,000,000	4,038,000,000	16,617,000,000	12,440,000,000
Australia
Segment Reporting Information [Line Items]
Sales and other operating revenues		515,000,000	323,000,000	1,258,000,000	1,050,000,000
Canada
Segment Reporting Information [Line Items]
Sales and other operating revenues		427,000,000	544,000,000	1,583,000,000	2,027,000,000
China
Segment Reporting Information [Line Items]
Sales and other operating revenues		262,000,000	148,000,000	616,000,000	511,000,000
Indonesia
Segment Reporting Information [Line Items]
Sales and other operating revenues		234,000,000	191,000,000	662,000,000	554,000,000
Malaysia
Segment Reporting Information [Line Items]
Sales and other operating revenues		339,000,000	297,000,000	1,039,000,000	768,000,000
Norway
Segment Reporting Information [Line Items]
Sales and other operating revenues		734,000,000	583,000,000	2,112,000,000	1,751,000,000
United Kingdom
Segment Reporting Information [Line Items]
Sales and other operating revenues		574,000,000	437,000,000	1,911,000,000	1,498,000,000
Libya
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	264,000,000	91,000,000	802,000,000	315,000,000
Other Non US Countries
Segment Reporting Information [Line Items]
Sales and other operating revenues		75,000,000	36,000,000	151,000,000	73,000,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		9,449,000,000	6,688,000,000	26,751,000,000	20,987,000,000
Alaska [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,493,000,000	932,000,000	4,281,000,000	3,010,000,000
Lower 48 [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		4,543,000,000	3,102,000,000	12,347,000,000	9,422,000,000
Lower 48 [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		4,529,000,000	3,100,000,000	12,329,000,000	9,415,000,000
Lower 48 [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		(14,000,000)	(2,000,000)	(18,000,000)	(7,000,000)
Canada
Segment Reporting Information [Line Items]
Sales and other operating revenues		735,000,000	699,000,000	2,436,000,000	2,357,000,000
Canada | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		427,000,000	544,000,000	1,583,000,000	2,027,000,000
Canada | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		(308,000,000)	(155,000,000)	(853,000,000)	(330,000,000)
Europe and North Africa [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,574,000,000	1,110,000,000	4,826,000,000	3,564,000,000
Asia Pacific and Middle East [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,348,000,000	959,000,000	3,570,000,000	2,877,000,000
Corporate and Other [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 78,000,000	$ 43,000,000	$ 162,000,000	$ 94,000,000
[1] Included in "Other foreign countries" in prior periods

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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