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Segments - Revenues from contracts with customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]      
Revenues from contracts with customers $ 62,657 $ 77,246 $ 60,971
Over/Under lift 0 137 0
Taxes paid in kind 344 865 0
Physically settled commodity derivatives (1,086) 488 0
Gain (loss) on commodity derivatives 732 (216) 0
Other revenues 265 36 0
Total other revenues 254 1,309 0
Revenues 62,911 78,555 60,971
Crude oil [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 33,505 40,948 29,519
Crude oil [member] | European [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 9,366 11,675 9,739
Crude oil [member] | North America [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 1,359 1,581 1,248
Crude oil [member] | Other incl LNG [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 556 814 433
Natural gas [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 11,281 14,070 11,420
Refined products [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 10,652 13,124 11,423
Natural gas liquids [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 5,807 7,167 5,647
Trasnsportation [Member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers 967 1,033 0
Other sales [member]      
Disclosure of geographical areas [line items]      
Revenues from contracts with customers $ 445 $ 903 $ 2,963