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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
Jun. 30, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost, net $ 815 $ 822
Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 825 833
Allowance (10) (11)
Amortized cost, net 815 822
Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 343  
Mortgage loans | 2020    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 52  
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 103  
Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 144  
Mortgage loans | Current    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Below 1.0 | Mortgage loans    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 13 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 13  
Below 1.0 | Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 0  
Below 1.0 | Mortgage loans | Current    
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 41 41
1.0 - 1.25 | Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 39  
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 0  
1.0 - 1.25 | Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 2  
1.0 - 1.25 | Mortgage loans | Current    
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 180 133
1.26 - 1.50 | Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 74  
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 66  
1.26 - 1.50 | Mortgage loans | Current    
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 591 $ 646
Above 1.50 | Mortgage loans | 2019 and prior    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 230  
Above 1.50 | Mortgage loans | 2020    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 42  
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 60  
Above 1.50 | Mortgage loans | 2023    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance 76  
Above 1.50 | Mortgage loans | Current    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized cost before allowance $ 0