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Other Contingencies and Commitments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
guarantee
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Guarantees      
Number of guarantees | guarantee 1    
Guarantee for payments under terminal use agreements $ 98    
Term of guarantee for payments under terminal use agreement (in years) 3 years    
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 year one $ 1,039    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year two 1,129    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year three 1,304    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year four 1,326    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year five 1,236    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements after year five 6,882    
Total payments under long term unconditional purchase obligations and commitments including throughput and Take-or-Pay agreements $ 1,354 $ 1,420 $ 1,866
Environmental      
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Accrued Liabilities, Current, Deferred credits and other noncurrent obligations    
Environmental reserve balance $ 945    
Liability balance 2,478 $ 2,708  
Contingency expenses 235    
Upstream      
Environmental      
Environmental reserve 236    
United States | Downstream      
Environmental      
Environmental reserve 440    
International | Downstream      
Environmental      
Environmental reserve 49    
Other Obligations      
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 year one 436    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year two 653    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year three 477    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year four 380    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in year five 186    
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements after year five 907    
Sites with Potential Remediation Activities      
Environmental      
Environmental reserve 220    
Environmental Reserve Less Environmental Reserve for Sites with Potential Remediation Activities      
Environmental      
Environmental reserve $ 725