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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Lease, Liability $ 1,000 $ 1,000    
Operating Lease, Right-of-Use Asset 1,000 1,000    
Asset Retirement Obligation 193 193 $ 220  
Costs Incurred, Asset Retirement Obligation Incurred   13 9 $ 7
Tangible Asset Impairment Charges   9 127 133
ARO Underlying Asset 106 106 103  
Asset Retirement Obligation, Legally Restricted Assets, Fair Value 26 26 21  
Long-term Debt, Fair Value 45,060 45,060 45,620  
Impairment losses   378 (895)  
Goodwill acquired   495 12  
Goodwill 4,885 4,885 4,768 5,670
Long-term Debt 46,028 46,028 44,084  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   0    
Midstream [Member]        
Tangible Asset Impairment Charges       10
Impairment losses   378 0 (32)
Goodwill acquired   0 8  
Goodwill 492 492 870 863
Other Segments [Member]        
Impairment losses   0 (452)  
Goodwill acquired   0 0  
Goodwill 149 149 402 854
Retail Marketing [Member]        
Excise Taxes Collected   370 234 $ 243
Sunoco LP [Member]        
Inventory Write-down   85    
Long-term Debt 2,984 2,984 4,287  
Customer relationships, contracts and agreements (3 to 46 years)        
Impairment of Intangible Assets (Excluding Goodwill) 30   13  
Other Amortizable Intangible Assets [Member]        
Impairment of Intangible Assets (Excluding Goodwill)     $ 4  
ETC Marketing [Member] | Other Segments [Member]        
Goodwill $ 72 $ 72