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Deferred tax assets and liabilities - Additional information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]      
Unremitted earnings retained for reinvestment $ 9,000,000,000 $ 9,000,000,000  
Temporary differences and unused tax losses for which no deferred tax assets were recognized 9,000,000,000 9,000,000,000  
Capital loss carryforwards for which no deferred tax assets were recognized, expiring in four years 120,000,000 103,000,000  
Tax loss carryforwards capitalized 1,429,000,000 1,047,000,000  
Tax loss carryforwards expiring in five years 45,000,000    
Tax loss carryforwards not expiring in five years 1,384,000,000    
Amount with indefinite carryforward period 776,000,000    
Tax loss carryforwards expiring in 6 to 20 years 608,000,000    
Gross value of tax loss carryforwards for which no deferred tax assets were recognized 438,000,000    
Tax loss carryforwards expired in period $ 0 $ 0 $ 0