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Variable Interest Entities (VIEs) (Details) - Phillips 66 Partners - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Equity investments
Variable Interest Entity [Line Items]
Variable interest entity consolidated, assets, noncurrent, pledged	$ 1,142	$ 945
Net properties, plants and equipment
Variable Interest Entity [Line Items]
Variable interest entity consolidated, assets, noncurrent, pledged	$ 2,675	$ 2,437

X

- Definition

Variable Interest Entity Consolidated, Assets, Noncurrent, Pledged

+ References

No definition available.

+ Details

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Namespace Prefix:	psx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: