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Financial structure and financial costs - Variations of financial debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period $ 62,200 $ 53,115 $ 51,579
Cash changes 9,071 2,302 (3,341)
Non-cash changes, Change in scope, including IFRS 5 reclassifications (462) (453) 4,933
Non-cash changes, First application IFRS 16   5,505  
Non-cash changes, Foreign currency 25 136 222
Non-cash changes, Changes in fair value 191 370 79
Non-cash changes, Other 1,818 1,225 (357)
Balance as of the end of the period 72,843 62,200 53,115
NON-CURRENT FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period 46,861 39,449 40,661
Cash changes 15,572 8,131 649
Non-cash changes, Change in scope, including IFRS 5 reclassifications (453) (719) 4,636
Non-cash changes, First application IFRS 16   4,755  
Non-cash changes, Foreign currency 133 (44) (47)
Non-cash changes, Changes in fair value 244 413 121
Non-cash changes, Reclassification Non-current/Current (8,593) (6,517) (6,260)
Non-cash changes, Other 1,658 1,393 (311)
Balance as of the end of the period 55,422 46,861 39,449
Non-current financial assets      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period (912) (680) (679)
Cash changes (228) 21  
Non-cash changes, Change in scope, including IFRS 5 reclassifications 3 12 (72)
Non-cash changes, First application IFRS 16   (50)  
Non-cash changes, Foreign currency (59) 4 12
Non-cash changes, Changes in fair value (2,729) (71) 59
Non-cash changes, Reclassification Non-current/Current 118 144  
Non-cash changes, Other (974) (292)  
Balance as of the end of the period (4,781) (912) (680)
Non-current financial debt      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period 47,773 40,129 41,340
Cash changes 15,800 8,110 649
Non-cash changes, Change in scope, including IFRS 5 reclassifications (456) (731) 4,708
Non-cash changes, First application IFRS 16   4,805  
Non-cash changes, Foreign currency 192 (48) (59)
Non-cash changes, Changes in fair value 2,973 484 62
Non-cash changes, Reclassification Non-current/Current (8,711) (6,661) (6,260)
Non-cash changes, Other 2,632 1,685 (311)
Balance as of the end of the period 60,203 47,773 40,129
CURRENT FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period 15,038 13,666 10,918
Cash changes (6,501) (5,829) (3,990)
Non-cash changes, Change in scope, including IFRS 5 reclassifications 1 (35) 297
Non-cash changes, First application IFRS 16   750  
Non-cash changes, Foreign currency (130) 180 269
Non-cash changes, Changes in fair value (53) (43) (42)
Non-cash changes, Reclassification Non-current/Current 8,593 6,517 6,260
Non-cash changes, Other 160 (168) (46)
Balance as of the end of the period 17,108 15,038 13,666
Current financial assets      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period (268) (118) (423)
Cash changes 178 125  
Non-cash changes, Foreign currency (6) 2 10
Non-cash changes, Changes in fair value 46 (32) 295
Non-cash changes, Reclassification Non-current/Current (118) (144)  
Non-cash changes, Other (26) (101)  
Balance as of the end of the period (194) (268) (118)
Current borrowings      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period 14,819 13,306 11,096
Cash changes (6,679) (5,954) (3,990)
Non-cash changes, Change in scope, including IFRS 5 reclassifications 6 (35) 230
Non-cash changes, First application IFRS 16   750  
Non-cash changes, Foreign currency (132) 184 270
Non-cash changes, Changes in fair value 188 (26) (514)
Non-cash changes, Reclassification Non-current/Current 8,711 6,661 6,260
Non-cash changes, Other 186 (67) (46)
Balance as of the end of the period 17,099 14,819 13,306
Other current financial liabilities      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period 487 478 245
Non-cash changes, Change in scope, including IFRS 5 reclassifications (5)   67
Non-cash changes, Foreign currency 8 (6) (11)
Non-cash changes, Changes in fair value (287) 15 177
Balance as of the end of the period 203 487 $ 478
Financial liabilities and financial assets classified as held for sale      
Disclosure of detailed information about financial instruments [line items]      
Balance as of the beginning of the period 301    
Non-cash changes, Change in scope, including IFRS 5 reclassifications (10) 301  
Non-cash changes, Foreign currency 22    
Balance as of the end of the period $ 313 $ 301