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Employee Benefit Plans (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 shares	Dec. 31, 2009	Dec. 31, 2008	May 31, 2013 shares	Jan. 02, 2009
Employee Benefit Plans (Textual) [Abstract]
Net actuarial gains and losses, Percent amortized	10.00%
Health care cost trend rate, ultimate, percentage	5.00%
Percentage-point change in the assumed health care cost trend rate	1.00%
Maximum employee contribution of eligible pay, Percent	75.00%
Semi-annual discretionary company contribution target, Percent	2.00%
Total expense related to participants in the Savings Plan	$ 99	$ 134	$ 112
Minimum service period to avoid award forfeiture, in months	6 months
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares	$ 16.94	$ 18.84	$ 18.95
Intrinsic value of options exercised	$ 58	$ 60	$ 89
Date of performance awards authorization relative to grant date				3 years
U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	2,601	2,485
Employee Benefit Plans (Textual) [Abstract]
Expected future employer contributions next fiscal year	130
Int’l.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	880	303
Accumulated benefit obligations		$ 712
Employee Benefit Plans (Textual) [Abstract]
Expected future employer contributions next fiscal year	$ 35
Other Benefits
Employee Benefit Plans (Textual) [Abstract]
Health care cost trend rate, percentage	6.50%
Equity securities
Employee Benefit Plans (Textual) [Abstract]
Target allocations for plan assets	62.00%
Debt Securities
Employee Benefit Plans (Textual) [Abstract]
Target allocations for plan assets	37.00%
Other Types of Investments
Employee Benefit Plans (Textual) [Abstract]
Target allocations for plan assets	1.00%
Stock Options
Employee Benefit Plans (Textual) [Abstract]
Stock option terms in years	10 years
Weighted-average remaining contractual terms of vested options	5 years 4 months 10 days
Weighted-average remaining contractual terms of exercisable options	4 years 6 months 22 days
Cash received from the exercise of options	$ 34
Tax benefit from the exercise of options	16
Unrecognized compensation expense from unvested awards held by employees	$ 5
Weighted-average period for recognition of unrecognized compensation expense from unvested awards	21 months
Longest period for recognition of unrecognized compensation expense from unvested awards	27 months
Restricted Stock Units (RSUs)
Employee Benefit Plans (Textual) [Abstract]
Award vesting rights	one-third
Number of shares of common stock to be issued per stock unit | shares	1
Unrecognized compensation expense from unvested awards held by employees	$ 48
Weighted-average period for recognition of unrecognized compensation expense from unvested awards	21 months
Longest period for recognition of unrecognized compensation expense from unvested awards	49 months
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 78.56	$ 74.09	$ 73.28
Aggregate fair value	$ 109	$ 107	$ 116
Performance Shares
Employee Benefit Plans (Textual) [Abstract]
Number of shares of common stock to be issued per stock unit | shares				1
Unrecognized compensation expense from unvested awards held by employees	$ 9
Weighted-average period for recognition of unrecognized compensation expense from unvested awards	29 months
Longest period for recognition of unrecognized compensation expense from unvested awards	10 years
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 78.62	$ 74.14	$ 72.26
Aggregate fair value	$ 26	$ 37	$ 13
Eligible retirement age						55		55
Years of service					5 years	5 years
Minimum
Employee Benefit Plans (Textual) [Abstract]
Minimum participant contribution to Savings Plan to be eligible for Success Share, Percent	1.00%
Semi-annual discretionary company contribution, Percent	0.00%
Maximum
Employee Benefit Plans (Textual) [Abstract]
Company match of participant's contributions of eligible pay, Percent	5.00%
Semi-annual discretionary company contribution, Percent	6.00%
Employees Eligible for Retirement | Stock Options
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	6 months
Employees Eligible for Retirement | Restricted Stock Units (RSUs)
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	6 months
Awards Vesting Ratably Over Three Years On Anniversary Of Grant Date | Stock Options
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	3 years
Before April 30, 2012 | Restricted Stock Units (RSUs)
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	5 years
Before April 30, 2012 | Awards Vesting Over Five Years, First Third Of Units | Restricted Stock Units (RSUs)
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	36 months
Before April 30, 2012 | Awards Vesting Over Five Years, Second Third Of Units | Restricted Stock Units (RSUs)
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	48 months
Before April 30, 2012 | Awards Vesting Over Five Years, Final Third Of Units | Restricted Stock Units (RSUs)
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	60 months
2013 Omnibus Stock And Performance Incentive Plan Of Phillips 66
Employee Benefit Plans (Textual) [Abstract]
Common stock issuable under P66 Omnibus Plan, maximum (in shares) | shares							45,000,000
2013 Omnibus Stock And Performance Incentive Plan Of Phillips 66 | Cliff Vesting | Restricted Stock Units (RSUs)
Employee Benefit Plans (Textual) [Abstract]
Award vesting period	3 years

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Target percentage of employees' gross pay for which the employer may contribute a discretionary contribution to a defined contribution plan.

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The effect of one-percentage-point change in the assumed health care cost trend rate.

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Employee benefit plans.

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Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Longest Period for Recognition

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Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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