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Investments, Loans and Long-Term Receivables (Narrative) (Details)
shares in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 06, 2019
shares
Feb. 28, 2019
USD ($)
Jul. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
joint_venture
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
pipeline
joint_venture
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2020
USD ($)
Sep. 06, 2019
USD ($)
Jul. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jan. 31, 2019
Mar. 01, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]                              
Equity investments       $ 14,284,000,000   $ 14,284,000,000 $ 14,218,000,000                
Advances/loans—related parties           98,000,000 1,000,000 $ 10,000,000              
Cash contribution           3,873,000,000 2,639,000,000 1,832,000,000              
Dividends received from affiliates           2,055,000,000 2,942,000,000 1,270,000,000              
Retained earnings related to undistributed earnings of affiliated companies       2,360,000,000   2,360,000,000                  
Collection of advances/loans—related parties           95,000,000 0 326,000,000              
Senior Notes                              
Schedule of Equity Method Investments [Line Items]                              
Debt issued and guaranteed                             $ 1,500,000,000
Dakota Access, LLC | Senior Notes                              
Schedule of Equity Method Investments [Line Items]                              
Debt issued and guaranteed                         $ 2,500,000,000    
DAPL and ETCOP                              
Schedule of Equity Method Investments [Line Items]                              
Maximum exposure, undiscounted, co-venturers       $ 2,525,000,000   $ 2,525,000,000                  
Rockies Express Pipeline LLC (REX)                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       25.00%   25.00%                  
Amount of debt repaid by REX     $ 550,000,000                        
Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Equity investments       $ 2,961,000,000   $ 2,961,000,000 2,448,000,000                
Phillips 66 Partners | Phillips 66 Partners LP | Senior Notes                              
Schedule of Equity Method Investments [Line Items]                              
Debt issued and guaranteed                   $ 900,000,000          
Chevron Phillips Chemical Company LLC                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       50.00%   50.00%                  
Equity investments       $ 6,229,000,000   $ 6,229,000,000 6,233,000,000                
WRB Refining LP                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       50.00%   50.00%                  
Equity investments       $ 2,183,000,000   $ 2,183,000,000 2,108,000,000                
Amortization period           26 years                  
Equity investments, basis difference       $ 2,428,000,000   $ 2,428,000,000                  
Equity investment, amortization of basis difference           $ 182,000,000 177,000,000 186,000,000              
Collection of advances/loans—related parties               75,000,000              
DCP Midstream                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       50.00%   50.00%                  
Equity investments       $ 1,374,000,000   $ 1,374,000,000 2,240,000,000                
Amortization period           22 years                  
Equity investments, basis difference       877,000,000   $ 877,000,000                  
Equity investment, amortization of basis difference       10,000,000                      
Noncash impairment, before-tax         $ 853,000,000                    
DCP Partners                              
Schedule of Equity Method Investments [Line Items]                              
New issued common units (in shares) | shares 65                            
Gray Oak Pipeline LLC                              
Schedule of Equity Method Investments [Line Items]                              
Maximum loan       $ 1,170,000,000   1,170,000,000         $ 1,317,000,000 $ 1,230,000,000      
Advances/loans—related parties           95,000,000                  
Collection of advances/loans—related parties           $ 95,000,000                  
Gray Oak Pipeline LLC | Third Party                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership   10.00%                          
Gray Oak Pipeline LLC | Gray Oak Holdings LLC                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       65.00%   65.00%                  
Gray Oak Pipeline LLC | Subsequent Event                              
Schedule of Equity Method Investments [Line Items]                              
Maximum loan                 $ 1,379,000,000            
Gray Oak Pipeline LLC | Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest   65.00%   42.25%   42.25%               75.00%  
Equity investments       $ 759,000,000   $ 759,000,000 288,000,000                
Proceeds from sale of equity method investments   $ 81,000,000                          
Carrying amount of indemnifications       494,000,000   494,000,000                  
Maximum loss exposure       $ 1,253,000,000   $ 1,253,000,000                  
Gray Oak Pipeline LLC | Phillips 66 Partners | Subsequent Event | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Maximum exposure                 $ 583,000,000            
DCP Southern Hills Pipeline, LLC | Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       33.00%   33.00%                  
Equity investments       $ 215,000,000   $ 215,000,000 206,000,000                
DCP Sand Hills Pipeline, LLC | Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       33.00%   33.00%                  
Equity investments       $ 595,000,000   $ 595,000,000 601,000,000                
Dakota Access, LLC | Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       25.00%   25.00%                  
DAPL and ETCOP                              
Schedule of Equity Method Investments [Line Items]                              
Collection of advances/loans—related parties               250,000,000              
DAPL and ETCOP | Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Equity investments       $ 592,000,000   $ 592,000,000 608,000,000                
Maximum exposure, undiscounted       631,000,000   631,000,000                  
Rockies Express Pipeline LLC (REX)                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest     25.00%                        
Equity investments       590,000,000   $ 590,000,000 600,000,000                
Amortization period           25 years                  
Equity investments, basis difference       $ 338,000,000   $ 338,000,000                  
Equity investment, amortization of basis difference           $ 19,000,000 19,000,000 19,000,000              
Cash contribution     $ 138,000,000                        
Bayou Bridge Pipeline LLC | Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       40.00%   40.00%                  
Equity investments       $ 294,000,000   $ 294,000,000 277,000,000                
CF United LLC                              
Schedule of Equity Method Investments [Line Items]                              
Equity investments       $ 265,000,000   $ 265,000,000                  
Voting interest acquired       50.00%   50.00%                  
Economic interest rate       48.00%   48.00%                  
OnCue Holdings LLC                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       50.00%   50.00%                  
Equity investments             $ 69,000,000                
Maximum exposure       $ 67,000,000   $ 67,000,000                  
Maximum loss exposure       144,000,000   144,000,000                  
Maximum exposure, net book value of the investment       $ 77,000,000   $ 77,000,000                  
Liberty Pipeline, LLC                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       50.00%   50.00%                  
Maximum exposure       $ 151,000,000   $ 151,000,000                  
Maximum loss exposure       184,000,000   184,000,000                  
Maximum exposure, net book value of the investment       $ 33,000,000   $ 33,000,000                  
Red Oak Pipeline, LLC                              
Schedule of Equity Method Investments [Line Items]                              
Percentage of ownership interest       50.00%   50.00%                  
Equity investments       $ 20,000,000   $ 20,000,000                  
Maximum loss exposure       $ 23,000,000   23,000,000                  
Payments of advances to affiliates           $ 3,000,000                  
DAPL, ETCOP and WRB                              
Schedule of Equity Method Investments [Line Items]                              
Collection of advances/loans—related parties               $ 325,000,000              
Dakota Access LLC and Energy Transfer Crude Oil Company, LLC | Phillips 66 Partners | Phillips 66 Partners LP                              
Schedule of Equity Method Investments [Line Items]                              
Number of joint ventures | joint_venture       2   2                  
Number of pipelines | pipeline           2                  
Equity Method Investee | DCP Partners | DCP Midstream                              
Schedule of Equity Method Investments [Line Items]                              
Noncontrolling interest | shares 118                            
Noncontrolling interest ownership percent 57.00%                            
Minimum | Chevron Phillips Chemical Company LLC                              
Schedule of Equity Method Investments [Line Items]                              
Supply and purchase agreements, initial term           1 year                  
Maximum | Chevron Phillips Chemical Company LLC                              
Schedule of Equity Method Investments [Line Items]                              
Supply and purchase agreements, initial term           99 years