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Operating Segments and Geographic Data (Details 3) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Segment Assets    
Segment Assets $ 255,878 $ 253,863
Goodwill 4,507 4,518
United States    
Segment Assets    
Segment Assets 75,853 71,560
International    
Segment Assets    
Segment Assets 175,518 177,785
Operating Segments    
Segment Assets    
Segment Assets 244,034 240,461
Operating Segments | Upstream    
Segment Assets    
Segment Assets 200,678 200,973
Goodwill 4,507 4,518
Operating Segments | Upstream | United States    
Segment Assets    
Segment Assets 45,103 42,594
Operating Segments | Upstream | International    
Segment Assets    
Segment Assets 151,068 153,861
Operating Segments | Downstream    
Segment Assets    
Segment Assets 43,356 39,488
Operating Segments | Downstream | United States    
Segment Assets    
Segment Assets 26,247 23,866
Operating Segments | Downstream | International    
Segment Assets    
Segment Assets 17,109 15,622
All Other    
Segment Assets    
Segment Assets 11,844 13,402
All Other | United States    
Segment Assets    
Segment Assets 4,503 5,100
All Other | International    
Segment Assets    
Segment Assets $ 7,341 $ 8,302