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Financial and capital risk management - Financial counterparties' ratings (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Cash and cash equivalents    
Disclosure of external credit grades [line items]    
Credit exposure $ 14,600 $ 14,258
Cash and cash equivalents | Aa1    
Disclosure of external credit grades [line items]    
Credit exposure 94 2,210
Cash and cash equivalents | Aa2    
Disclosure of external credit grades [line items]    
Credit exposure 384 363
Cash and cash equivalents | Aa3    
Disclosure of external credit grades [line items]    
Credit exposure 603 1,681
Cash and cash equivalents | A1    
Disclosure of external credit grades [line items]    
Credit exposure 4,124 2,812
Cash and cash equivalents | A2    
Disclosure of external credit grades [line items]    
Credit exposure 4,429 4
Cash and cash equivalents | A3    
Disclosure of external credit grades [line items]    
Credit exposure 1,034 5
Cash and cash equivalents | Baa1    
Disclosure of external credit grades [line items]    
Credit exposure   4
Cash and cash equivalents | Baa2    
Disclosure of external credit grades [line items]    
Credit exposure 19 1
Cash and cash equivalents | Ba1    
Disclosure of external credit grades [line items]    
Credit exposure   2,986
Cash and cash equivalents | Ba2    
Disclosure of external credit grades [line items]    
Credit exposure 2,551 4,189
Cash and cash equivalents | Ba3    
Disclosure of external credit grades [line items]    
Credit exposure 1,279  
Cash and cash equivalents | Others    
Disclosure of external credit grades [line items]    
Credit exposure 83 3
Derivatives    
Disclosure of external credit grades [line items]    
Credit exposure 422 200
Derivatives | Aa1    
Disclosure of external credit grades [line items]    
Credit exposure   36
Derivatives | Aa2    
Disclosure of external credit grades [line items]    
Credit exposure 13 15
Derivatives | Aa3    
Disclosure of external credit grades [line items]    
Credit exposure 41 41
Derivatives | A1    
Disclosure of external credit grades [line items]    
Credit exposure 20 21
Derivatives | A2    
Disclosure of external credit grades [line items]    
Credit exposure 130 20
Derivatives | A3    
Disclosure of external credit grades [line items]    
Credit exposure 67 36
Derivatives | Ba1    
Disclosure of external credit grades [line items]    
Credit exposure 35  
Derivatives | Ba2    
Disclosure of external credit grades [line items]    
Credit exposure 51 6
Derivatives | Ba3    
Disclosure of external credit grades [line items]    
Credit exposure 13  
Derivatives | Others    
Disclosure of external credit grades [line items]    
Credit exposure $ 52 $ 25