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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
May 31, 2017
USD ($)
Oct. 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Aug. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Lessee, Operating Lease, Term of Contract           40 years          
Payments for Environmental Liabilities           $ 32,000,000 $ 43,000,000        
Operating leases rent expense           196,000,000 187,000,000 $ 281,000,000      
Amounts recorded in balance sheets for contingencies and current litigation not disclosed           0          
Total environmental liabilities           372,000,000 344,000,000        
Operating Leases, Rent Expense, Contingent Rentals           $ 16,000,000 18,000,000 20,000,000      
Site Contingency, Number of Sites Needing Remediation           43          
Proposed Environmental Penalty           $ 0     $ 100,000 $ 100,000  
Payments to Acquire Businesses, Gross     $ 382,000,000                
Long-term Debt           44,084,000,000 43,802,000,000        
BP Products North America [Member]                      
Loss Contingency, Damages Awarded, Value   $ 13,000,000   $ 62,000,000       $ 41,000,000      
Sunoco LP [Member]                      
Long-term Debt           4,287,000,000 4,514,000,000        
Williams [Member]                      
Loss on Contract Termination for Default         $ 410,000,000            
Loss Contingency, Damages Sought         1.48            
Loss Contingency, Damages Sought, Value         $ 10,000,000,000            
Permian Express 2 [Member]                      
Proposed Environmental Penalty                     $ 100,000
Related To Deductibles [Member]                      
Accrual for loss contingency           $ 33,000,000 77,000,000        
Dropdown of Sunoco LLC Interest [Member]                      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage       31.58%              
Payments to Acquire Businesses, Gross       $ 775,000,000              
Equity Issued in Business Combination, Fair Value Disclosure       $ 41,000,000              
6.375% Senior Notes due April 2023 [Member] | Sunoco LP [Member]                      
Debt Instrument, Interest Rate, Stated Percentage           6.375%          
Senior Notes           $ 800,000,000 800,000,000        
6.25% Senior Notes due 2021 [Member] | Sunoco LP [Member]                      
Debt Instrument, Interest Rate, Stated Percentage           6.25%         6.25%
Senior Notes           $ 800,000,000 $ 800,000,000       $ 800,000,000
Term loan due 2019 [Member] | Sunoco LP [Member]                      
Long-term Debt           2,035,000,000          
Subsequent Event [Member] | 6.375% Senior Notes due April 2023 [Member] | Sunoco LP [Member]                      
Debt Instrument, Interest Rate, Stated Percentage 6.375%                    
Subsequent Event [Member] | 6.25% Senior Notes due 2021 [Member] | Sunoco LP [Member]                      
Debt Instrument, Interest Rate, Stated Percentage 6.25%                    
Subsequent Event [Member] | 4.875% senior notes due 2023 [Member] | Sunoco LP [Member]                      
Debt Instrument, Interest Rate, Stated Percentage 4.875%                    
Senior Notes $ 1,000,000,000                    
Subsequent Event [Member] | 5.500% senior notes due 2026 [Member] | Sunoco LP [Member]                      
Debt Instrument, Interest Rate, Stated Percentage 5.50%                    
Senior Notes $ 800,000,000                    
Subsequent Event [Member] | 5.875% senior notes due 2028 [Member] | Sunoco LP [Member]                      
Debt Instrument, Interest Rate, Stated Percentage 5.875%                    
Senior Notes $ 400,000,000                    
Federal [Member] | Sunoco Pipeline L.P. [Member]                      
Proposed Environmental Penalty           7,000,000          
State and Local Jurisdiction [Member] | Sunoco Pipeline L.P. [Member]                      
Proposed Environmental Penalty           $ 1,000,000          
PENNSYLVANIA | Subsequent Event [Member]                      
Civil penalties $ 12,600,000                    
Initial term [Member] | Minimum [Member]                      
Lessee, Operating Lease, Term of Contract           5 years          
Initial term [Member] | Maximum [Member]                      
Lessee, Operating Lease, Term of Contract           15 years          
Final Judgement [Member]                      
Gain Contingency, Unrecorded Amount           $ 536,000,000          
Expense Reimbursement [Member]                      
Gain Contingency, Unrecorded Amount           1,000,000          
Disgorgement [Member]                      
Gain Contingency, Unrecorded Amount           595,000,000          
Compensatory Damages [Member]                      
Gain Contingency, Unrecorded Amount           $ 319,000,000