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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Total Assets $ 239,535 $ 239,790
Goodwill 4,385 4,402
United States    
Segment Reporting Information [Line Items]    
Total Assets 73,992 69,938
International    
Segment Reporting Information [Line Items]    
Total Assets 161,158 165,450
Operating Segments    
Segment Reporting Information [Line Items]    
Total Assets 229,636 230,895
Operating Segments | Upstream    
Segment Reporting Information [Line Items]    
Total Assets 184,412 191,309
Goodwill 4,385 4,402
Operating Segments | Upstream | United States    
Segment Reporting Information [Line Items]    
Total Assets 41,870 42,431
Operating Segments | Upstream | International    
Segment Reporting Information [Line Items]    
Total Assets 138,157 144,476
Operating Segments | Downstream    
Segment Reporting Information [Line Items]    
Total Assets 45,224 39,586
Operating Segments | Downstream | United States    
Segment Reporting Information [Line Items]    
Total Assets 26,376 23,490
Operating Segments | Downstream | International    
Segment Reporting Information [Line Items]    
Total Assets 18,848 16,096
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Total Assets 9,899 8,895
Segment Reconciling Items | United States    
Segment Reporting Information [Line Items]    
Total Assets 5,746 4,017
Segment Reconciling Items | International    
Segment Reporting Information [Line Items]    
Total Assets $ 4,153 $ 4,878