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Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Oct. 31, 2016	Oct. 28, 2016	Feb. 28, 2015
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term borrowing maturities, 2017	$ 1,550,000,000
Long-term borrowing maturities, 2018	43,000,000
Long-term borrowing maturities, 2019	31,000,000
Long-term borrowing maturities, 2020	335,000,000
Long-term borrowing maturities, 2021	231,000,000
Long-term debt, current maturities	$ 1,000,000,000
Maximum consolidated net debt-to-capitalization ratio, percent	0.6
Borrowings under commercial paper program	$ 0
Revolving Credit Facility
Long-term Debt, Fiscal Year Maturity [Abstract]
Maximum borrowing capacity		$ 5,000,000,000
Amount outstanding under facility	0
Letters of credit issued	51,000,000
Phillips 66 Partners | Revolving Credit Facility
Long-term Debt, Fiscal Year Maturity [Abstract]
Maximum borrowing capacity	500,000,000
Amount outstanding under facility	210,000,000
Phillips 66 Partners LP | Revolving Credit Facility
Long-term Debt, Fiscal Year Maturity [Abstract]
Maximum borrowing capacity			$ 750,000,000
Phillips 66 Partners LP | Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes		1,125,000,000.000		$ 1,100,000,000.0
Commercial Paper
Long-term Debt, Fiscal Year Maturity [Abstract]
Maximum borrowing capacity	$ 5,000,000,000
Phillips 66 Partners 2.646% Senior Notes due 2020 | Phillips 66 Partners LP | Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes				$ 300,000,000
Senior notes, interest percent	2.646%			2.646%
Phillips 66 Partners 3.55% Senior Notes due 2026 | Phillips 66 Partners LP | Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes		$ 500,000,000
Senior notes, interest percent	3.55%	3.55%
Phillips 66 Partners 3.605% Senior Notes due 2025 | Phillips 66 Partners LP | Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes				$ 500,000,000
Senior notes, interest percent	3.605%			3.605%
Phillips 66 Partners 4.90% Senior Notes due 2046 | Phillips 66 Partners LP | Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes		$ 625,000,000
Senior notes, interest percent	4.90%	4.90%
Phillips 66 Partners 4.680% Senior Notes due 2045 | Phillips 66 Partners LP | Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes				$ 300,000,000
Senior notes, interest percent	4.68%			4.68%
Maximum | Commercial Paper
Long-term Debt, Fiscal Year Maturity [Abstract]
Number of days maturities are generally limited to	90 days

X

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Indebtedness divided by net capital.

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