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Other assets - Seed Capital and Private Equity Investments (Details) - Other Assets - NAV - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Fair value $ 154 $ 152
Unfunded commitments 82 59
Seed capital    
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Fair value 7 7
Unfunded commitments $ 0 0
Fair value, investments, entities that calculate net asset value per share, liquidating investment, remaining period 7 days  
Private equity investments    
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Fair value $ 138 137
Unfunded commitments $ 82 59
Fair value, investments, entities that calculate net asset value per share, liquidating investment, remaining period 10 years  
Other    
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Fair value $ 9 8
Unfunded commitments $ 0 $ 0