XML 79 R68.htm IDEA: XBRL DOCUMENT
v3.20.2

Fair Value Measurements (Summary of Fair Value of Derivative Assets and Liabilities and Effect of Counterparty Netting) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Total Fair Value of Gross Assets | $ 1,401 | $ 1,342
Effect of Counterparty Netting | (1,241) | (1,188)
Effect of Collateral Netting | 0 | 0
Difference in Carrying Value and Fair Value | 0 | 0
Net Carrying Value Presented on the Balance Sheet | 160 | 154
Liabilities |  |
Total Fair Value Gross Liabilities | 17,242 | 14,195
Effect of Counterparty Netting | (1,241) | (1,188)
Effect of Collateral Netting | (168) | (80)
Difference in Carrying Value and Fair Value | (1,643) | (1,438)
Net Carrying Value Presented on the Balance Sheet | 14,190 | 11,489
Level 1 |  |
Assets |  |
Total Fair Value of Gross Assets | 979 | 947
Liabilities |  |
Total Fair Value Gross Liabilities | 986 | 884
Level 2 |  |
Assets |  |
Total Fair Value of Gross Assets | 422 | 395
Liabilities |  |
Total Fair Value Gross Liabilities | 16,255 | 13,311
Level 3 |  |
Assets |  |
Total Fair Value of Gross Assets | 0 | 0
Liabilities |  |
Total Fair Value Gross Liabilities | 1 | 0
Commodity Derivatives | Exchange-cleared instruments |  |
Assets |  |
Total Fair Value of Gross Assets | 1,242 | 1,188
Effect of Counterparty Netting | (1,241) | (1,188)
Effect of Collateral Netting | 0 | 0
Difference in Carrying Value and Fair Value | 0 | 0
Net Carrying Value Presented on the Balance Sheet | 1 | 0
Liabilities |  |
Commodity Derivative Liabilities | 1,410 | 1,269
Effect of Counterparty Netting | (1,241) | (1,188)
Effect of Collateral Netting | (168) | (80)
Difference in Carrying Value and Fair Value | 0 | 0
Net Carrying Value Presented on the Balance Sheet | 1 | 1
Commodity Derivatives | OTC instruments |  |
Liabilities |  |
Commodity Derivative Liabilities |  | 1
Effect of Counterparty Netting |  | 0
Effect of Collateral Netting |  | 0
Difference in Carrying Value and Fair Value |  | 0
Net Carrying Value Presented on the Balance Sheet |  | 1
Commodity Derivatives | Physical forward contracts |  |
Assets |  |
Total Fair Value of Gross Assets | 30 | 26
Effect of Counterparty Netting | 0 | 0
Effect of Collateral Netting | 0 | 0
Difference in Carrying Value and Fair Value | 0 | 0
Net Carrying Value Presented on the Balance Sheet | 30 | 26
Liabilities |  |
Commodity Derivative Liabilities | 15 | 12
Effect of Counterparty Netting | 0 | 0
Effect of Collateral Netting | 0 | 0
Difference in Carrying Value and Fair Value | 0 | 0
Net Carrying Value Presented on the Balance Sheet | 15 | 12
Commodity Derivatives | Level 1 | Exchange-cleared instruments |  |
Assets |  |
Total Fair Value of Gross Assets | 850 | 820
Liabilities |  |
Commodity Derivative Liabilities | 986 | 884
Commodity Derivatives | Level 1 | OTC instruments |  |
Liabilities |  |
Commodity Derivative Liabilities |  | 0
Commodity Derivatives | Level 1 | Physical forward contracts |  |
Assets |  |
Total Fair Value of Gross Assets | 0 | 0
Liabilities |  |
Commodity Derivative Liabilities | 0 | 0
Commodity Derivatives | Level 2 | Exchange-cleared instruments |  |
Assets |  |
Total Fair Value of Gross Assets | 392 | 368
Liabilities |  |
Commodity Derivative Liabilities | 424 | 385
Commodity Derivatives | Level 2 | OTC instruments |  |
Liabilities |  |
Commodity Derivative Liabilities |  | 1
Commodity Derivatives | Level 2 | Physical forward contracts |  |
Assets |  |
Total Fair Value of Gross Assets | 30 | 26
Liabilities |  |
Commodity Derivative Liabilities | 14 | 12
Commodity Derivatives | Level 3 | Exchange-cleared instruments |  |
Assets |  |
Total Fair Value of Gross Assets | 0 | 0
Liabilities |  |
Commodity Derivative Liabilities | 0 | 0
Commodity Derivatives | Level 3 | OTC instruments |  |
Liabilities |  |
Commodity Derivative Liabilities |  | 0
Commodity Derivatives | Level 3 | Physical forward contracts |  |
Assets |  |
Total Fair Value of Gross Assets | 0 | 0
Liabilities |  |
Commodity Derivative Liabilities | 1 | 0
Interest rate derivatives |  |
Assets |  |
Interest rate derivatives |  | 1
Effect of Counterparty Netting |  | 0
Effect of Collateral Netting |  | 0
Difference in Carrying Value and Fair Value |  | 0
Net Carrying Value Presented on the Balance Sheet |  | 1
Liabilities |  |
Interest rate derivatives | 7 |
Effect of Counterparty Netting | 0 |
Effect of Collateral Netting | 0 |
Difference in Carrying Value and Fair Value | 0 |
Net Carrying Value Presented on the Balance Sheet | 7 |
Interest rate derivatives | Level 1 |  |
Assets |  |
Interest rate derivatives |  | 0
Liabilities |  |
Interest rate derivatives | 0 |
Interest rate derivatives | Level 2 |  |
Assets |  |
Interest rate derivatives |  | 1
Liabilities |  |
Interest rate derivatives | 7 |
Interest rate derivatives | Level 3 |  |
Assets |  |
Interest rate derivatives |  | 0
Liabilities |  |
Interest rate derivatives | 0 |
Rabbi trust assets |  |
Assets |  |
Rabbi trust assets | 129 | 127
Difference in Carrying Value and Fair Value | 0 | 0
Rabbi trust assets | Level 1 |  |
Assets |  |
Rabbi trust assets | 129 | 127
Rabbi trust assets | Level 2 |  |
Assets |  |
Rabbi trust assets | 0 | 0
Rabbi trust assets | Level 3 |  |
Assets |  |
Rabbi trust assets | 0 | 0
Floating-rate debt |  |
Liabilities |  |
Debt | 1,787 | 1,100
Difference in Carrying Value and Fair Value | 0 | 0
Floating-rate debt | Net Carrying Value Presented on the Balance Sheet |  |
Liabilities |  |
Debt | 1,787 | 1,100
Floating-rate debt | Level 1 |  |
Liabilities |  |
Debt | 0 | 0
Floating-rate debt | Level 2 |  |
Liabilities |  |
Debt | 1,787 | 1,100
Floating-rate debt | Level 3 |  |
Liabilities |  |
Debt | 0 | 0
Fixed-rate debt, excluding finance leases |  |
Liabilities |  |
Debt | 14,023 | 11,813
Difference in Carrying Value and Fair Value | (1,643) | (1,438)
Fixed-rate debt, excluding finance leases | Net Carrying Value Presented on the Balance Sheet |  |
Liabilities |  |
Debt | 12,380 | 10,375
Fixed-rate debt, excluding finance leases | Level 1 |  |
Liabilities |  |
Debt | 0 | 0
Fixed-rate debt, excluding finance leases | Level 2 |  |
Liabilities |  |
Debt | 14,023 | 11,813
Fixed-rate debt, excluding finance leases | Level 3 |  |
Liabilities |  |
Debt | $ 0 | $ 0

X
- Definition Asset, Fair Value Amount Offset Against Collateral + References No definition available. + Details
Name: | psx_AssetFairValueAmountOffsetAgainstCollateral
Namespace Prefix: | psx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative Asset, Difference In Carrying Value And Fair Value + References No definition available. + Details
Name: | psx_DerivativeAssetDifferenceInCarryingValueAndFairValue
Namespace Prefix: | psx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative Liability, Difference In Carrying Value And Fair Value + References No definition available. + Details
Name: | psx_DerivativeLiabilityDifferenceInCarryingValueAndFairValue
Namespace Prefix: | psx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount by which the aggregate fair value of the liability exceeds (or is less than) the carrying value. + References No definition available. + Details
Name: | psx_DifferenceInCarryingValueAndFairValueLiability
Namespace Prefix: | psx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financial And Nonfinancial Liability, Difference In Carrying Value And Fair Value + References No definition available. + Details
Name: | psx_FinancialAndNonfinancialLiabilityDifferenceInCarryingValueAndFairValue
Namespace Prefix: | psx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financial And Nonfinancial Liability, Fair Value, Amount Offset Against Collateral + References No definition available. + Details
Name: | psx_FinancialAndNonfinancialLiabilityFairValueAmountOffsetAgainstCollateral
Namespace Prefix: | psx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeAssetFairValueGrossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DerivativeAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 + Details
Name: | us-gaap_DerivativeCollateralObligationToReturnSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, after effects of master netting arrangements, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DerivativeLiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
Name: | us-gaap_DerivativeLiabilityFairValueGrossAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
Name: | us-gaap_InterestRateCashFlowHedgeAssetAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
Name: | us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TransactionTypeAxis=us-gaap_ExchangeClearedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TransactionTypeAxis=us-gaap_OverTheCounterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TransactionTypeAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=psx_RabbiTrustAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=psx_FloatingRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=psx_FixedRateDebtExcludingCapitalLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |