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Operating Segments and Geographic Data (Details 3) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Segment Assets    
Segment Assets $ 256,537 $ 253,863
Goodwill 4,507 4,518
United States    
Segment Assets    
Segment Assets 75,342 71,560
International    
Segment Assets    
Segment Assets 176,688 177,785
Operating Segments    
Segment Assets    
Segment Assets 241,502 240,461
Operating Segments | Upstream    
Segment Assets    
Segment Assets 199,620 200,973
Goodwill 4,507 4,518
Operating Segments | Upstream | United States    
Segment Assets    
Segment Assets 45,689 42,594
Operating Segments | Upstream | International    
Segment Assets    
Segment Assets 149,424 153,861
Operating Segments | Downstream    
Segment Assets    
Segment Assets 41,882 39,488
Operating Segments | Downstream | United States    
Segment Assets    
Segment Assets 25,111 23,866
Operating Segments | Downstream | International    
Segment Assets    
Segment Assets 16,771 15,622
All Other    
Segment Assets    
Segment Assets 15,035 13,402
All Other | United States    
Segment Assets    
Segment Assets 4,542 5,100
All Other | International    
Segment Assets    
Segment Assets $ 10,493 $ 8,302