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Deferred tax assets and liabilities (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets $ 8,140 $ 6,799  
Tax loss carryforwards expired 6 18 $ 14
One year [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 18 19  
Two years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 42 20  
Three years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 30 47  
Four years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 138 37  
Five years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 767 166  
More than five years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 6,260 5,408  
Not subject to expiry [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 885 1,102  
Capitalized [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 3,530 2,607  
Capitalized [member] | One year [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 0 4  
Capitalized [member] | Two years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 5 6  
Capitalized [member] | Three years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 5 10  
Capitalized [member] | Four years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 0 11  
Capitalized [member] | Five years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 688 20  
Capitalized [member] | More than five years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 2,380 1,872  
Capitalized [member] | Not subject to expiry [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 452 684  
Not capitalized [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 4,610 4,192  
Not capitalized [member] | One year [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 18 15  
Not capitalized [member] | Two years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 37 14  
Not capitalized [member] | Three years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 25 37  
Not capitalized [member] | Four years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 138 26  
Not capitalized [member] | Five years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 79 146  
Not capitalized [member] | More than five years [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets 3,880 3,536  
Not capitalized [member] | Not subject to expiry [member]      
Statement [line items]      
Gross Value of tax loss carryforwards that have or have not been capitalized as deferred tax assets $ 433 $ 418