Entities Under Common Control, Assets Received, Value

No definition available.

Name:	psxp_EntitiesUnderCommonControlAssetsReceivedValue
Namespace Prefix:	psxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of liabilities assumed that were allocated to the value of assets received from an entity under common control.

+ References

No definition available.

+ Details

Name:	psxp_EntitiesUnderCommonControlAssumptionOfNotePayableAssignedToAssetsReceived
Namespace Prefix:	psxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

That portion of the cash purchase price in a common control transaction attributable to the carryover basis of the net assets acquired. This amount is classified as an investing cash outflow.

+ References

No definition available.

+ Details

Name:	psxp_EntitiesUnderCommonControlCashPaymentAssignedtoAssetsReceived
Namespace Prefix:	psxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Entities Under Common Control, Cash Payment for Assets Received, Assigned to Distributions

+ References

No definition available.

+ Details

Name:	psxp_EntitiesUnderCommonControlCashPaymentforAssetsReceivedAssignedtoDistributions
Namespace Prefix:	psxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Entities Under Common Control, Cash Payments for Receipt of Transferred Assets

+ References

No definition available.

+ Details

Name:	psxp_EntitiesUnderCommonControlCashPaymentsforReceiptofTransferredAssets
Namespace Prefix:	psxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Entities Under Common Control, Percentage Of Voting Interests Received

+ References

No definition available.

+ Details

Name:	psxp_EntitiesUnderCommonControlPercentageOfVotingInterestsReceived
Namespace Prefix:	psxp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Value assigned to units issued in exchange for assets received in a noncash (or part noncash) transaction between entities under common control.

+ References

No definition available.

+ Details

Name:	psxp_EntitiesUnderCommonControlValueAssignedToUnitsIssuedInExchangeForAssetsTransfered1
Namespace Prefix:	psxp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=psxp_ExplorerPipelineCompanyDcpSandHillsPipelineLlcDcpSouthernHillsPipelineLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=us-gaap_GeneralPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=psxp_Phillips66Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_MajorityShareholderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LimitedPartnersCapitalAccountByClassAxis=psxp_CommonUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=psxp_SweenyFractionatorAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=psxp_CommonPartnerAndGeneralPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: