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Financial instruments - Reconciliation of changes in fair value (Details) - Level 3 [member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement [line items]    
Opening balance $ 657 $ 510
Total gains and losses recognised in statement of income, assets 108 109
Purchases, assets 119 64
Settlement, assets (27) (36)
Transfer to level 1 0 1
Foreign currency translation differences (13) 9
Closing balance 844 657
Non-current derivative financial instruments liabilities [Member]    
Disclosure of fair value measurement [line items]    
Opening balance (5) (19)
Total gains and losses recognised in statement of income, liabilities 1 14
Closing balance (4) (5)
Non-current financial investments [Member]    
Disclosure of fair value measurement [line items]    
Opening balance 308 277
Total gains and losses recognised in statement of income, assets (23) (29)
Purchases, assets 119 64
Settlement, assets (7) (8)
Transfer to level 1 0 1
Foreign currency translation differences (3) 4
Closing balance 394 308
Non-current derivative financial instruments - assets [Member]    
Disclosure of fair value measurement [line items]    
Opening balance 330 219
Total gains and losses recognised in statement of income, assets 58 106
Foreign currency translation differences (8) 5
Closing balance 380 330
Current derivative financial instruments, assets [Member]    
Disclosure of fair value measurement [line items]    
Opening balance 24 33
Total gains and losses recognised in statement of income, assets 72 19
Settlement, assets (20) (28)
Foreign currency translation differences (2) 0
Closing balance $ 74 $ 24