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% |