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Guarantees (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Guarantor Obligations [Line Items] |  |
Environmental accruals included in recorded carrying amount | $ 429,000,000 | $ 441,000,000
Gray Oak Pipeline LLC | Variable Interest Entity, Primary Beneficiary | Phillips 66 Partners LP |  |
Guarantor Obligations [Line Items] |  |
Maximum potential amount of future payments under the guarantees | $ 583,000,000 |
Effective ownership percent | 42.25% |
Other joint ventures and entities |  |
Guarantor Obligations [Line Items] |  |
Joint venture debt obligations, period (up to) | eight years |
Other Guarantees | Other joint ventures and entities |  |
Guarantor Obligations [Line Items] |  |
Maximum potential amount of future payments under the guarantees | $ 155,000,000 |
Indemnifications |  |
Guarantor Obligations [Line Items] |  |
Carrying amount of indemnifications | 154,000,000 | 153,000,000
Indemnifications | Asset Retirement Obligations And Accrued Environmental Cost |  |
Guarantor Obligations [Line Items] |  |
Environmental accruals included in recorded carrying amount | 107,000,000 | $ 105,000,000
Facilities | Residual Value Guarantees |  |
Guarantor Obligations [Line Items] |  |
Maximum potential amount of future payments under the guarantees | 554,000,000 |
Railcar and Airplane | Residual Value Guarantees |  |
Guarantor Obligations [Line Items] |  |
Maximum potential amount of future payments under the guarantees | $ 351,000,000 |
Lessee leasing arrangements, operating leases, term of contract (up to) | 4 years |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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