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Goodwill (Carrying Amount of Goodwill by Segment) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020
Goodwill [Roll Forward]
Balance at January 1, 2020	$ 3,270,000,000	$ 3,270,000,000
Impairments		(1,845,000,000)
Balance at June 30, 2020		1,425,000,000
Midstream
Goodwill [Roll Forward]
Balance at January 1, 2020	626,000,000	626,000,000
Impairments		0
Balance at June 30, 2020		626,000,000
Refining
Goodwill [Roll Forward]
Balance at January 1, 2020	1,845,000,000	1,845,000,000
Impairments	(1,845,000,000)	(1,845,000,000)
Balance at June 30, 2020	0	0
M&S
Goodwill [Roll Forward]
Balance at January 1, 2020	$ 799,000,000	799,000,000
Impairments		0
Balance at June 30, 2020		$ 799,000,000

X

- 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

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+ References

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