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Guarantees (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2018
Oct. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 28, 2019
Jan. 31, 2019
Guarantor Obligations [Line Items]              
Environmental accruals for known contaminations     $ 441,000,000 $ 447,000,000      
Other Joint Ventures | Maximum              
Guarantor Obligations [Line Items]              
Joint venture debt obligations, period (up to)     6 years        
Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary | Gray Oak Pipeline LLC              
Guarantor Obligations [Line Items]              
Percentage of ownership interest     42.25%     65.00% 75.00%
Carrying amount of indemnifications     $ 494,000,000        
Other Guarantees | Other Joint Ventures              
Guarantor Obligations [Line Items]              
Maximum exposure of loss/potential amount of future payments     263,000,000        
Indemnifications              
Guarantor Obligations [Line Items]              
Carrying amount of indemnifications     153,000,000 171,000,000      
Indemnifications | Asset Retirement Obligations And Accrued Environmental Cost              
Guarantor Obligations [Line Items]              
Environmental accruals for known contaminations     $ 105,000,000 101,000,000      
Facilities              
Guarantor Obligations [Line Items]              
Lessee leasing arrangements, operating leases (up to)     5 years        
Facilities | Residual Value Guarantees              
Guarantor Obligations [Line Items]              
Maximum exposure of loss/potential amount of future payments     $ 554,000,000        
Railcar and Airplane | Residual Value Guarantees              
Guarantor Obligations [Line Items]              
Maximum exposure of loss/potential amount of future payments     $ 372,000,000        
Lessee leasing arrangements, operating leases (up to)     4 years        
Operating leases, expense     $ 1,000,000        
Operating leases, expense       $ 20,000,000 $ 45,000,000    
Railcars | Residual Value Guarantees              
Guarantor Obligations [Line Items]              
Residual value guarantee liability $ 40,000,000 $ 53,000,000