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Segments - Revenues from contracts with customers (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure of geographical areas [line items]            
Revenue from contracts with customers $ 17,402 $ 16,664 $ 7,677 $ 34,067 $ 21,631 $ 45,088
Taxes paid in kind 80 78 (9) 158 38 93
Other revenues 74 69 61 143 113 256
Total other revenues (23) (536) (114) (558) 996 665
Revenues 17,380 16,129 7,563 33,508 22,627 45,753
Commodity derivatives [member]            
Disclosure of geographical areas [line items]            
Physically settled commodity derivatives 294 (159) 152 135 251 209
Gain/(loss) on commodity derivatives (471) (523) (318) (994) 594 108
Crude oil [member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 9,060 8,714 4,018 17,774 11,858 24,509
Natural gas [Member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 3,443 3,298 1,188 6,741 3,358 7,213
Natural gas [Member] | European [member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 2,908 2,661 923 5,569 2,691 5,839
Natural gas [Member] | North America [member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 319 422 196 741 486 1,010
Natural gas [Member] | Other including LNG [member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 215 216 68 431 181 363
Refined products [Member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 2,682 2,373 1,258 5,055 3,287 6,534
Natural gas liquids [Member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 1,672 1,910 839 3,582 2,288 5,069
Transportation [Member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers 205 256 286 461 615 1,083
Other sales [member]            
Disclosure of geographical areas [line items]            
Revenue from contracts with customers $ 341 $ 112 $ 88 $ 454 $ 225 $ 681