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Segments - Revenues from contracts with customers and other revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]      
Revenues from contracts with customers $ 45,088 $ 62,657 $ 77,246
Over/Under lift     137
Taxes paid in kind 93 344 865
Physically settled commodity derivatives 209 (1,086) 488
Gain (loss) on commodity derivatives 108 732 (216)
Other revenues 256 265 36
Total other revenues 665 254 1,309
Revenues 45,753 62,911 78,555
Crude oil [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 24,509 33,505 40,948
Natural gas [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 7,213 11,281 14,070
Natural gas [Member] | European [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 5,839 9,366 11,675
Natural gas [Member] | North America [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 1,010 1,359 1,581
Natural gas [Member] | Other incl LNG [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 363 556 814
Refined products [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 6,534 10,652 13,124
Natural gas liquids [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 5,069 5,807 7,167
Trasnsportation [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 1,083 967 1,033
Other sales [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers $ 681 $ 445 $ 903