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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Segment Assets    
Assets $ 263,927 $ 257,709
Goodwill 4,722 4,722
United States    
Segment Assets    
Assets 100,536 93,783
International    
Segment Assets    
Assets 158,669 159,204
Operating Segments    
Segment Assets    
Assets 253,939 236,326
Operating Segments | Upstream    
Segment Assets    
Assets 197,575 183,105
Goodwill 4,370 4,370
Operating Segments | Upstream | United States    
Segment Assets    
Assets 59,326 44,246
Operating Segments | Upstream | International    
Segment Assets    
Assets 133,879 134,489
Operating Segments | Downstream    
Segment Assets    
Assets 56,364 53,221
Goodwill 352 352
Operating Segments | Downstream | United States    
Segment Assets    
Assets 33,466 31,676
Operating Segments | Downstream | International    
Segment Assets    
Assets 22,546 21,193
All Other    
Segment Assets    
Assets 9,988 21,383
All Other | United States    
Segment Assets    
Assets 7,744 17,861
All Other | International    
Segment Assets    
Assets $ 2,244 $ 3,522