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Fair Value Measurements (Narrative) (Details)	3 Months Ended	6 Months Ended
	Mar. 31, 2020 USD ($) d	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, impairment loss		$ 1,845,000,000
Goodwill		1,425,000,000	$ 3,270,000,000
DCP Partners | Fair Value, Nonrecurring | Trading Period | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment, measurement input | d	15
Refining
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, impairment loss	$ 1,845,000,000	1,845,000,000
Goodwill	$ 0	$ 0	$ 1,845,000,000

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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.

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