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Impairments (Tables)
3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Impairments
Millions of Dollars
 Three Months Ended
March 31
 20212020
Midstream$198 1,161 
Refining 1,845 
Total impairments$198 3,006