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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Segment Assets    
Assets $ 255,886 $ 257,709
Goodwill 4,722 4,722
United States    
Segment Assets    
Assets 90,780 93,783
International    
Segment Assets    
Assets 160,384 159,204
Operating Segments    
Segment Assets    
Assets 236,423 236,326
Operating Segments | Upstream    
Segment Assets    
Assets 181,882 183,105
Goodwill 4,370 4,370
Operating Segments | Upstream | United States    
Segment Assets    
Assets 44,621 44,246
Operating Segments | Upstream | International    
Segment Assets    
Assets 132,891 134,489
Operating Segments | Downstream    
Segment Assets    
Assets 54,541 53,221
Goodwill 352 352
Operating Segments | Downstream | United States    
Segment Assets    
Assets 32,075 31,676
Operating Segments | Downstream | International    
Segment Assets    
Assets 22,114 21,193
All Other    
Segment Assets    
Assets 19,463 21,383
All Other | United States    
Segment Assets    
Assets 14,084 17,861
All Other | International    
Segment Assets    
Assets $ 5,379 $ 3,522