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General and significant accounting policies (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
May 15, 2024
Mar. 07, 2024
Dec. 31, 2023
Jul. 01, 2023
INA Senior Notes Due March 2034 [Domain] | Senior Notes [Member]          
General and significant accounting policies [Line Items]          
Debt Instrument, Face Amount     $ 1,000    
Debt Instrument, Interest Rate, Stated Percentage     5.00%    
Make Whole Premium Additional Percent     0.15%    
INA Senior Notes Due May 2024 | Senior Notes [Member]          
General and significant accounting policies [Line Items]          
Debt Instrument, Face Amount   $ 700      
Debt Instrument, Interest Rate, Stated Percentage   3.35%      
Huatai Group          
General and significant accounting policies [Line Items]          
Subsidiary, Ownership Percentage, Parent 85.50%     76.50% 69.60%