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Investments - Schedule of Mortgage Loans Amortized Cost by Debt Service Coverage Ratio Distribution and Year of Origination (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, net $ 831 $ 784
Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 849  
Mortgage loans | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 697 735
Allowance (17) (12)
Amortized cost, net 680 723
Mortgage loans | 2020 and prior | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 270  
Mortgage loans | 2021 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 164  
Mortgage loans | 2022 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 89  
Mortgage loans | 2023 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 120  
Mortgage loans | 2024 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 54  
Mortgage loans | 2025 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.0 - 1.25 | Mortgage loans | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 101 137
1.0 - 1.25 | Mortgage loans | 2020 and prior | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 37  
1.0 - 1.25 | Mortgage loans | 2021 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.0 - 1.25 | Mortgage loans | 2022 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.0 - 1.25 | Mortgage loans | 2023 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 25  
1.0 - 1.25 | Mortgage loans | 2024 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 39  
1.0 - 1.25 | Mortgage loans | 2025 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.26 - 1.50 | Mortgage loans | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 92 105
1.26 - 1.50 | Mortgage loans | 2020 and prior | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 31  
1.26 - 1.50 | Mortgage loans | 2021 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.26 - 1.50 | Mortgage loans | 2022 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 42  
1.26 - 1.50 | Mortgage loans | 2023 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 19  
1.26 - 1.50 | Mortgage loans | 2024 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.26 - 1.50 | Mortgage loans | 2025 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Above 1.50 | Mortgage loans | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 504 $ 493
Above 1.50 | Mortgage loans | 2020 and prior | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 202  
Above 1.50 | Mortgage loans | 2021 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 164  
Above 1.50 | Mortgage loans | 2022 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 47  
Above 1.50 | Mortgage loans | 2023 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 76  
Above 1.50 | Mortgage loans | 2024 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 15  
Above 1.50 | Mortgage loans | 2025 | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance $ 0