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Investments and Advances - Summary of Investment and Advances and Equity in Earnings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Investments and Advances $ 35,261 $ 32,105  
Other non-equity method investments 285 392  
Total investments and advances 35,546 32,497  
Equity in Earnings 6,327 4,438 $ 2,661
United States | Investments and Advances      
Schedule of Equity Method Investments [Line Items]      
Total investments and advances 7,500 7,582  
United States | Equity in Earnings      
Schedule of Equity Method Investments [Line Items]      
Equity in Earnings 1,033 788 802
International | Investments and Advances      
Schedule of Equity Method Investments [Line Items]      
Total investments and advances 28,046 24,915  
International | Equity in Earnings      
Schedule of Equity Method Investments [Line Items]      
Equity in Earnings 5,294 3,650 1,859
All Other      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances (16) (15)  
Equity in Earnings (2) (1) (4)
Upstream | Operating Segments      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 23,752 20,843  
Equity in Earnings 4,649 3,196 1,243
Upstream | Operating Segments | Tengizchevroil      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 16,017 13,121  
Equity in Earnings 3,614 2,581 1,380
Upstream | Operating Segments | Petropiar      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 1,361 1,152  
Equity in Earnings 317 175 326
Upstream | Operating Segments | Petroboscan      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 1,315 1,080  
Equity in Earnings 357 154 (133)
Upstream | Operating Segments | Caspian Pipeline Consortium      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 1,022 1,151  
Equity in Earnings 170 155 145
Upstream | Operating Segments | Angola LNG Limited      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 2,496 2,625  
Equity in Earnings 172 27 (282)
Upstream | Operating Segments | Other      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 1,541 1,714  
Equity in Earnings 19 104 (193)
Downstream | Operating Segments      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 11,525 11,277  
Equity in Earnings 1,680 1,243 1,422
Downstream | Operating Segments | Chevron Phillips Chemical Company LLC      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 6,218 6,200  
Equity in Earnings 1,034 723 840
Downstream | Operating Segments | GS Caltex Corporation      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 3,924 3,826  
Equity in Earnings 373 290 373
Downstream | Operating Segments | Other      
Schedule of Equity Method Investments [Line Items]      
Investments and Advances 1,383 1,251  
Equity in Earnings $ 273 $ 230 $ 209