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Sales and Other Operating Revenue - Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from contracts with customers	$ 7,953	$ 8,504	$ 17,103	$ 17,302
Physical gas contracts [Member]
Revenue from contracts with customers	1,371	1,719	3,452	3,980
Crude oil product line [Member]
Revenue from contracts with customers	165	290	353	576
Natural Gas Product Line [Member]
Revenue from contracts with customers	1,095	1,363	2,863	3,253
Other Products [Member]
Revenue from contracts with customers	111	66	236	151
Financial Derivative Contracts [Member]
Revenue from contracts with customers	(51)	42	(41)	34
Lower 48 Segment | Physical gas contracts [Member]
Revenue from contracts with customers	1,111	1,300	2,724	3,013
Canada Segment [Member] | Physical gas contracts [Member]
Revenue from contracts with customers	100	96	341	287
Europe and North Africa Segment [Member] | Physical gas contracts [Member]
Revenue from contracts with customers	160	323	387	680
Accounting Standards Update 2014-09 [Member]
Revenue from contracts with customers	$ 6,633	$ 6,743	$ 13,692	$ 13,288

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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