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Investment Information - Investments in operating affiliates (Details)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
€ / shares
Jul. 01, 2021
$ / shares
Schedule of Equity Method Investments [Line Items]          
Investment in operating affiliates $ 1,119 $ 965      
Income (loss) from operating affiliates $ 184 75 $ 264    
Coface          
Schedule of Equity Method Investments [Line Items]          
Percentage ownership 29.90%   29.50% 29.50%  
Investment in affiliate, price per share | € / shares       € 9.95  
Equity method investment, aggregate cost     $ 546 € 453  
Operating affiliate gain on acquisition     75    
Operating affiliates , deferred gain on acquisition     $ 36    
Operating affiliates, deferred gain on acquisition, amortization period     5 years    
Investment in operating affiliates $ 570 563      
Coface | Issued Shares Excluding Treasury Stock          
Schedule of Equity Method Investments [Line Items]          
Percentage ownership 30.10%        
Greysbridge Holdings Ltd          
Schedule of Equity Method Investments [Line Items]          
Percentage ownership         40.00%
Investment in affiliate, price per share | $ / shares         $ 35.00
Equity method investment, aggregate cost     $ 279    
Operating affiliate gain on acquisition     96    
Investment in operating affiliates $ 430 $ 306      
Greysbridge Holdings Ltd | Kelso And Company          
Schedule of Equity Method Investments [Line Items]          
Percentage ownership         30.00%
Greysbridge Holdings Ltd | Warburg Pincus LLC          
Schedule of Equity Method Investments [Line Items]          
Percentage ownership         30.00%
Somers Holdings Ltd.          
Schedule of Equity Method Investments [Line Items]          
Gain (loss) on deconsolidation     $ 33