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Debt (Details) - USD ($)				1 Months Ended
	Jun. 10, 2020	Apr. 09, 2020	Mar. 19, 2020	Apr. 30, 2020	Jun. 30, 2020	Apr. 06, 2020
Senior Notes
Debt Instrument [Line Items]
Debt issued and guaranteed	$ 1,000,000,000	$ 1,000,000,000
Senior Notes | 2.150% Senior Notes due June 8, 2030
Debt Instrument [Line Items]
Debt issued and guaranteed	$ 850,000,000
Debt interest rate	2.15%
Senior Notes | 3.70% Senior Notes due April 6, 2023
Debt Instrument [Line Items]
Debt issued and guaranteed		$ 500,000,000
Debt interest rate		3.70%
Senior Notes | 3.850% Senior Notes due April 9, 2025
Debt Instrument [Line Items]
Debt issued and guaranteed	$ 650,000,000	$ 650,000,000
Debt interest rate	3.85%	3.85%
Senior Notes | 3.850% Senior Notes Due April 9, 2025, Portion Issued June 10, 2020
Debt Instrument [Line Items]
Debt issued and guaranteed	$ 150,000,000
Senior Notes | 3.850% Senior Notes Due April 9, 2025, Portion Issued April 9, 2020
Debt Instrument [Line Items]
Debt issued and guaranteed		$ 500,000,000
Senior Notes | Senior Unsecured Notes
Debt Instrument [Line Items]
Proceeds from borrowings	$ 1,008,000,000	$ 993,000,000
Line of Credit | Term Loan
Debt Instrument [Line Items]
Proceeds from borrowings			$ 1,000,000,000
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000			$ 2,000,000,000
Delayed term			364 days
Undrawn capacity					$ 1,000,000,000
Line of Credit | Revolving Credit Facility | Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					750,000,000
Amount borrowed					215,000,000
Line of Credit | Letter of Credit | Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Amount borrowed					$ 3,000,000
Loans Payable | Floating Rate Notes Due April 2020
Debt Instrument [Line Items]
Repayments of debt				$ 300,000,000
Loans Payable | Term Loan Due April 2020
Debt Instrument [Line Items]
Repayments of debt				200,000,000
Tax-Exempt Bonds | Tax Exempt Bonds Due 2020 | Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Repayments of debt				$ 25,000,000

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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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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 of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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