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Financial and capital risk management - Financial counterparties' ratings (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Cash and cash equivalents    
Disclosure of external credit grades [line items]    
Credit exposure $ 11,905 $ 14,258
Cash and cash equivalents | Aa1    
Disclosure of external credit grades [line items]    
Credit exposure 128 92
Cash and cash equivalents | Aa2    
Disclosure of external credit grades [line items]    
Credit exposure 285 363
Cash and cash equivalents | Aa3    
Disclosure of external credit grades [line items]    
Credit exposure 495 1,147
Cash and cash equivalents | A1    
Disclosure of external credit grades [line items]    
Credit exposure 1,145 2,574
Cash and cash equivalents | A2    
Disclosure of external credit grades [line items]    
Credit exposure 3,478 4,760
Cash and cash equivalents | A3    
Disclosure of external credit grades [line items]    
Credit exposure 1,518 540
Cash and cash equivalents | Baa1    
Disclosure of external credit grades [line items]    
Credit exposure 90 4
Cash and cash equivalents | Baa2    
Disclosure of external credit grades [line items]    
Credit exposure 10 2
Cash and cash equivalents | Ba2    
Disclosure of external credit grades [line items]    
Credit exposure 2,763 2,932
Cash and cash equivalents | Ba3    
Disclosure of external credit grades [line items]    
Credit exposure 1,988 1,842
Cash and cash equivalents | Others    
Disclosure of external credit grades [line items]    
Credit exposure 5 2
Derivative financial instruments    
Disclosure of external credit grades [line items]    
Credit exposure 131 200
Derivative financial instruments | Aa2    
Disclosure of external credit grades [line items]    
Credit exposure 15 14
Derivative financial instruments | Aa3    
Disclosure of external credit grades [line items]    
Credit exposure 34 37
Derivative financial instruments | A1    
Disclosure of external credit grades [line items]    
Credit exposure 3 21
Derivative financial instruments | A2    
Disclosure of external credit grades [line items]    
Credit exposure 39 55
Derivative financial instruments | A3    
Disclosure of external credit grades [line items]    
Credit exposure 20 40
Derivative financial instruments | Ba2    
Disclosure of external credit grades [line items]    
Credit exposure 5 2
Derivative financial instruments | Ba3    
Disclosure of external credit grades [line items]    
Credit exposure   4
Derivative financial instruments | Others    
Disclosure of external credit grades [line items]    
Credit exposure $ 15 $ 27