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Risk management (Details 11) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents $ 7,996,000,000 $ 10,467,000,000
Marketable securities 4,337,000,000 694,000,000
Aa Credit Grades One [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents   1,152,000,000
A Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 3,806,000,000 1,145,000,000
Marketable securities 820  
B B B Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 212,000,000 2,308,000,000
B B Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 917,000,000 3,672,000,000
Marketable securities 205,000,000  
Aaa Point Br Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 3,034,000,000 530,000,000
Marketable securities 3,311,000,000 694,000,000
Aa Point Br Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 1,000,000 1,639,000,000
Marketable securities 1,000,000  
Other Credit Grades [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents $ 26,000,000 $ 21,000,000