v3.25.4
Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2025
reporting_unit
Summary of Significant Accounting Policies [Line Items]  
Number of reporting units for purposes of testing goodwill for impairment 3
Payment term (in days) 30 days
2013 Omnibus Stock and Performance Incentive Plan of Phillips 66  
Summary of Significant Accounting Policies [Line Items]  
Minimum time required for an award not to be subject to forfeiture (in months) 10 months
Eligible retirement age 55
Years of service (in years) 5 years
Minimum  
Summary of Significant Accounting Policies [Line Items]  
Length of construction period for interest capitalization (in years) 1 year