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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, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, net $ 765 $ 822
Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 776 833
Allowance (11) (11)
Amortized cost, net 765 822
Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 293  
Mortgage loans | 2020    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 51  
Mortgage loans | 2021    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 183  
Mortgage loans | 2022    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 90  
Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 144  
Mortgage loans | 2024    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 15  
Below 1.0 | Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0 13
Below 1.0 | Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Below 1.0 | Mortgage loans | 2020    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Below 1.0 | Mortgage loans | 2021    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Below 1.0 | Mortgage loans | 2022    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Below 1.0 | Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Below 1.0 | Mortgage loans | 2024    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.0 - 1.25 | Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 105 41
1.0 - 1.25 | Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 60  
1.0 - 1.25 | Mortgage loans | 2020    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.0 - 1.25 | Mortgage loans | 2021    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.0 - 1.25 | Mortgage loans | 2022    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 18  
1.0 - 1.25 | Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 27  
1.0 - 1.25 | Mortgage loans | 2024    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.26 - 1.50 | Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 129 133
1.26 - 1.50 | Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 48  
1.26 - 1.50 | Mortgage loans | 2020    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 10  
1.26 - 1.50 | Mortgage loans | 2021    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
1.26 - 1.50 | Mortgage loans | 2022    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 30  
1.26 - 1.50 | Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 41  
1.26 - 1.50 | Mortgage loans | 2024    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Above 1.50 | Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 542 $ 646
Above 1.50 | Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 185  
Above 1.50 | Mortgage loans | 2020    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 41  
Above 1.50 | Mortgage loans | 2021    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 183  
Above 1.50 | Mortgage loans | 2022    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 42  
Above 1.50 | Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 76  
Above 1.50 | Mortgage loans | 2024    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance $ 15