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Derivatives and Financial Instruments (Summary of Outstanding Commodity Derivative Contracts) (Details) - MMBbls | Jun. 30, 2016 | Dec. 31, 2015
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Derivative [Line Items] |  |
Crude oil, refined products and NGL (millions of barrels) | (35) | (17)

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- Definition Non monetary notional amount of price risk derivative instruments not designated as hedging instruments short position. + References No definition available. + Details
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Namespace Prefix: | psx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- 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_DerivativeLineItems
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration