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Goodwill and Intangible Assets - Summary of intangible assets by major class (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance $ 1,523 $ 1,523  
Intangible assets with a finite life, accumulated amortization (766) (677)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (26) (42)  
Goodwill and intangible assets 731 804 $ 945
Intangible liability - unfavorable service contract      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance (10) (10)  
Intangible assets with a finite life, 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]      
Intangible assets with a finite life, accumulated amortization (766)    
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (23)    
Intangible assets with a finite life | Acquired insurance contracts      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 452 452  
Intangible assets with a finite life, accumulated amortization (441) (426)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 (1)  
Goodwill and intangible assets 11 25  
Intangible assets with a finite life | Operating platform      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 64 53  
Intangible assets with a finite life, accumulated amortization (54) (50)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 0  
Goodwill and intangible assets 10 3  
Intangible assets with a finite life | Distribution relationships      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 594 602  
Intangible assets with a finite life, accumulated amortization (277) (208)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (23) (31)  
Goodwill and intangible assets 294 363  
Intangible assets with a finite life | Other      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 5 5  
Intangible assets with a finite life, accumulated amortization (4) (3)  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 0  
Goodwill and intangible assets 1 2  
Goodwill      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 348 351  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments (3) (9)  
Goodwill and intangible assets 345 342  
Intangible assets with an indefinite life      
Schedule of Goodwill And Intangible Assets [Line Items]      
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0    
Intangible assets with an indefinite life | Insurance licenses      
Schedule of Goodwill And Intangible Assets [Line Items]      
Gross balance 48 48  
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments 0 0  
Goodwill and intangible assets 48 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 0 (1)  
Goodwill and intangible assets $ 22 $ 21