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Risk management (Details 13) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents $ 12,727 $ 7,996
Marketable securities 5,228 4,337
Aa Credit Grades One [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 593  
Marketable securities 651  
A Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 6,890 3,806
Marketable securities 464 820
B B B Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 20 212
B B Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 3,251 917
Marketable securities   205
Aaa Point Br Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 1,966 3,034
Marketable securities 4,113 3,311
Aa Point Br Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents   1
Marketable securities   1
Other Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents $ 7 $ 26