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Investments - Bank loans amortized cost by credit quality and year of origination (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Schedule of Available for Sale Securities    
Amortized cost, net $ 833 $ 821
Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 800 1,635
Allowance (52) (61)
Amortized cost, net 748 1,574
NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 49 86
NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 295 656
NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 361 768
NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 95 $ 125
2017 and prior | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 38  
2017 and prior | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 0  
2017 and prior | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 9  
2017 and prior | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 8  
2017 and prior | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 21  
2018 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 26  
2018 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 0  
2018 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 0  
2018 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 16  
2018 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 10  
2019 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 72  
2019 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 7  
2019 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 7  
2019 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 18  
2019 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 40  
2020 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 34  
2020 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 5  
2020 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 3  
2020 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 18  
2020 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 8  
2021 | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 581  
2021 | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 37  
2021 | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 262  
2021 | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 271  
2021 | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 11  
Current | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 49  
Current | NAIC 2 / BBB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 0  
Current | NAIC 3 / BB | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 14  
Current | NAIC 4 / B | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance 30  
Current | NAIC 5-6/ CCC and below | Bank loans, net    
Schedule of Available for Sale Securities    
Amortized cost before allowance $ 5