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Financial instruments - Fair value heirarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement [line items]      
Non-current derivative financial instruments - assets $ 1,265 $ 2,476 $ 1,365
Current financial investments 21,246 11,865  
Current derivative financial instruments - assets 5,131 886 578
Non-current derivative financial instruments - liabilities (767) (676)  
Current derivative financial instruments liabilities (4,609) (1,710) $ (462)
Fair value [member]      
Disclosure of fair value measurement [line items]      
Non-current financial investments 3,093 3,822  
Non-current derivative financial instruments - assets 1,265 2,476  
Current financial investments 300 216  
Current derivative financial instruments - assets 5,131 886  
Cash equivalents 2,714 492  
Non-current derivative financial instruments - liabilities (767) (676)  
Current derivative financial instruments liabilities (4,609) (1,710)  
Net fair value 7,127 5,505  
Level 1 [member]      
Disclosure of fair value measurement [line items]      
Non-current financial investments 860 1,379  
Non-current derivative financial instruments - assets 0 0  
Current financial investments 0 66  
Current derivative financial instruments - assets 949 419  
Non-current derivative financial instruments - liabilities 0 0  
Current derivative financial instruments liabilities (69) (432)  
Net fair value 1,740 1,432  
Level 2 [member]      
Disclosure of fair value measurement [line items]      
Non-current financial investments 1,840 2,135  
Non-current derivative financial instruments - assets 884 2,146  
Current financial investments 300 150  
Current derivative financial instruments - assets 4,108 443  
Cash equivalents 2,714 492  
Non-current derivative financial instruments - liabilities (762) (671)  
Current derivative financial instruments liabilities (4,539) (1,277)  
Net fair value 4,545 3,418  
Level 3 [member]      
Disclosure of fair value measurement [line items]      
Non-current financial investments 393 308  
Non-current derivative financial instruments - assets 380 330  
Current derivative financial instruments - assets 74 24  
Non-current derivative financial instruments - liabilities (4) (5)  
Net fair value $ 843 $ 657