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Investments - Bank loans amortized cost by credit quality and year of origination (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Schedule of Available for Sale Securities    
Amortized cost, net $ 823 $ 762
Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 729 743
Allowance (62) (57)
Amortized cost, net 667 686
NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 63 54
NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 219 266
NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 346 329
NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 101 $ 94
2018 and prior | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 57  
2018 and prior | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 4  
2018 and prior | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 0  
2018 and prior | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 15  
2018 and prior | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 38  
2019 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 57  
2019 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 6  
2019 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 4  
2019 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 17  
2019 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 30  
2020 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 22  
2020 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 4  
2020 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 1  
2020 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 15  
2020 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 2  
2021 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 416  
2021 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 42  
2021 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 150  
2021 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 202  
2021 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 22  
2022 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 64  
2022 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 5  
2022 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 15  
2022 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 37  
2022 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 7  
Current | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 113  
Current | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 2  
Current | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 49  
Current | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 60  
Current | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance $ 2