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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The carrying amount of goodwill by segment at June 30, 2020 was:
| Millions of Dollars |  |  |  |  |  |
| Midstream |  | Refining |  | M&S |  | Total
Balance at January 1, 2020 | $ | 626 |  |  | 1,845 |  |  | 799 |  |  | 3,270 |
Impairments | — |  |  | (1,845) |  |  | — |  |  | (1,845) |
Balance at June 30, 2020 | $ | 626 |  |  | — |  |  | 799 |  |  | 1,425 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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