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Financial and capital risk management - Financial counterparties' ratings (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
facility
Dec. 31, 2019
USD ($)
Revolving credit facilities    
Disclosure of external credit grades [line items]    
Number of facility | facility 2  
Available amount $ 5,000  
Cash and cash equivalents    
Disclosure of external credit grades [line items]    
Credit exposure 14,258 $ 8,176
Cash and cash equivalents | Aa1    
Disclosure of external credit grades [line items]    
Credit exposure 2,210 31
Cash and cash equivalents | Aa2    
Disclosure of external credit grades [line items]    
Credit exposure 363 1
Cash and cash equivalents | Aa3    
Disclosure of external credit grades [line items]    
Credit exposure 1,681 202
Cash and cash equivalents | A1    
Disclosure of external credit grades [line items]    
Credit exposure 2,812 1,468
Cash and cash equivalents | A2    
Disclosure of external credit grades [line items]    
Credit exposure 4 2,740
Cash and cash equivalents | A3    
Disclosure of external credit grades [line items]    
Credit exposure 5 109
Cash and cash equivalents | Baa1    
Disclosure of external credit grades [line items]    
Credit exposure 4 5
Cash and cash equivalents | Baa2    
Disclosure of external credit grades [line items]    
Credit exposure 1 47
Cash and cash equivalents | Baa3    
Disclosure of external credit grades [line items]    
Credit exposure   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 4,189 835
Cash and cash equivalents | Ba3    
Disclosure of external credit grades [line items]    
Credit exposure   2,735
Cash and cash equivalents | Others    
Disclosure of external credit grades [line items]    
Credit exposure 3 2
Derivative financial instruments (note 19)    
Disclosure of external credit grades [line items]    
Credit exposure 200 472
Derivative financial instruments (note 19) | Aa1    
Disclosure of external credit grades [line items]    
Credit exposure 36  
Derivative financial instruments (note 19) | Aa2    
Disclosure of external credit grades [line items]    
Credit exposure 15 11
Derivative financial instruments (note 19) | Aa3    
Disclosure of external credit grades [line items]    
Credit exposure 41 46
Derivative financial instruments (note 19) | A1    
Disclosure of external credit grades [line items]    
Credit exposure 21  
Derivative financial instruments (note 19) | A2    
Disclosure of external credit grades [line items]    
Credit exposure 20 138
Derivative financial instruments (note 19) | A3    
Disclosure of external credit grades [line items]    
Credit exposure 36 105
Derivative financial instruments (note 19) | Baa3    
Disclosure of external credit grades [line items]    
Credit exposure   117
Derivative financial instruments (note 19) | Ba2    
Disclosure of external credit grades [line items]    
Credit exposure 6  
Derivative financial instruments (note 19) | Others    
Disclosure of external credit grades [line items]    
Credit exposure $ 25 $ 55