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Goodwill and Intangible Assets - Summary of intangible assets by major class (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance $ 2,380 $ 1,523  
Accumulated amortization (994) (766)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (35) (26)  
Goodwill and intangible assets 1,351 731 $ 804
Intangible liability - unfavorable service contract      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance (10) (10)  
Accumulated amortization 10 10  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 0  
Goodwill and intangible assets 0 0  
Intangible assets with a finite life      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 1,724    
Accumulated amortization (994)    
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (29)    
Goodwill and intangible assets 701    
Intangible assets with a finite life | Acquired insurance contracts      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 620 452  
Accumulated amortization (562) (441)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 1 0  
Goodwill and intangible assets 59 11  
Intangible assets with a finite life | Operating platform      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 117 64  
Accumulated amortization (63) (54)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 0  
Goodwill and intangible assets 54 10  
Intangible assets with a finite life | Distribution relationships      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 865 594  
Accumulated amortization (358) (277)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (30) (23)  
Goodwill and intangible assets 477 294  
Intangible assets with a finite life | Other      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 132 5  
Accumulated amortization (21) (4)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 0  
Goodwill and intangible assets 111 1  
Goodwill      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 576 348  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (5) (3)  
Goodwill and intangible assets 571 345  
Intangible assets with an indefinite life      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 80    
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (1)    
Goodwill and intangible assets 79    
Intangible assets with an indefinite life | Insurance licenses      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 58 48  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 0  
Goodwill and intangible assets 58 48  
Intangible assets with an indefinite life | Syndicate capacity      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 22 22  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (1) 0  
Goodwill and intangible assets $ 21 $ 22