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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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