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Other Contingencies and Commitments (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Location
guaranty
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2009
USD ($)
Guarantees        
Number of guarantees | guaranty 2      
Guarantee for payments under terminal use agreements $ 1,082,000,000      
Idemnifications        
Indemnifications acquirer environmental liabilities, maximum obligation       $ 200,000,000
Long-Term Unconditional Purchase Obligations and Commitments, Including Throughput and Take-or-Pay Agreements        
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2018 1,402,000,000      
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2019 1,367,000,000      
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2020 1,027,000,000      
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2021 920,000,000      
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2022 555,000,000      
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2023 and after 2,566,000,000      
Total payments under long term unconditional purchase obligations and commitments including throughput and Take-or-Pay agreements 1,300,000,000 $ 1,300,000,000 $ 1,900,000,000  
Environmental        
Environmental reserve balance $ 1,429,000,000      
Sites with potential remediation activities (in sites) | Location 146      
Upstream        
Environmental        
Environmental reserve $ 340,000,000      
Other Businesses [Member]        
Environmental        
Environmental reserve 1,000,000      
Sites with Potential Remediation Activities [Member]        
Environmental        
Environmental reserve 269,000,000      
Environmental Reserve Less Environmental Reserve for Sites with Potential Remediation Activities [Member]        
Environmental        
Environmental reserve 1,160,000,000      
United States | Downstream        
Environmental        
Environmental reserve 781,000,000      
International | Downstream        
Environmental        
Environmental reserve 38,000,000      
Financing Arrangement        
Guarantees        
Guarantee for payments under terminal use agreements $ 712,000,000      
Term of guarantee for payments under terminal use agreement (in years) 4 years      
Affiliates        
Guarantees        
Guarantee for payments under terminal use agreements $ 370,000,000      
Term of guarantee for payments under terminal use agreement (in years) 10 years