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Investments - Schedule of Bank Loans Amortized Cost by Credit Rating and Year of Origination (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net $ 830 $ 762
Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 715 743
Allowance (36) (57)
Amortized cost, net 679 686
NAIC 2 / BBB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 54 54
NAIC 3 / BB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 195 266
NAIC 4 / B | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 394 329
NAIC 5-6 / CCC and below | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 72 $ 94
2018 and prior | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 50  
2018 and prior | NAIC 2 / BBB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 4  
2018 and prior | NAIC 3 / BB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 0  
2018 and prior | NAIC 4 / B | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 11  
2018 and prior | NAIC 5-6 / CCC and below | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 35  
2019 | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 23  
2019 | NAIC 2 / BBB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 5  
2019 | NAIC 3 / BB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 0  
2019 | NAIC 4 / B | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 17  
2019 | NAIC 5-6 / CCC and below | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 1  
2020 | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 21  
2020 | NAIC 2 / BBB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 5  
2020 | NAIC 3 / BB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 1  
2020 | NAIC 4 / B | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 14  
2020 | NAIC 5-6 / CCC and below | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 1  
2021 | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 385  
2021 | NAIC 2 / BBB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 26  
2021 | NAIC 3 / BB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 139  
2021 | NAIC 4 / B | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 197  
2021 | NAIC 5-6 / CCC and below | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 23  
2022 | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 53  
2022 | NAIC 2 / BBB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 4  
2022 | NAIC 3 / BB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 9  
2022 | NAIC 4 / B | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 34  
2022 | NAIC 5-6 / CCC and below | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 6  
Current | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 183  
Current | NAIC 2 / BBB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 10  
Current | NAIC 3 / BB | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 46  
Current | NAIC 4 / B | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance 121  
Current | NAIC 5-6 / CCC and below | Bank loans, net    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost before allowance $ 6