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Financial instruments - additional disclosures (Details 15) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Statement [line items]    
Hypothetical increase decrease percentage in equity price sensitivity 15.00%  
Hypothetical 15% increase [member]    
Statement [line items]    
Equity price sensitivity impact of the risk factors in the income statement $ 109 $ 154
Equity price sensitivity impact of the risk factors in the equity 124 179
Hypothetical 15% decrease [member]    
Statement [line items]    
Equity price sensitivity impact of the risk factors in the income statement (109) (154)
Equity price sensitivity impact of the risk factors in the equity $ (124) $ (179)