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Market Risk Benefits - Balances and Changes in Market Risk Benefit (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Market Risk Benefit [Line Items]      
Balance beginning of period $ 165 $ 428  
Balance, end of period 160 165 $ 428
As Previously Reported      
Market Risk Benefit [Line Items]      
Balance beginning of period     531
FIA      
Market Risk Benefit [Line Items]      
Balance beginning of period 164 426 478
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 102 280 320
Issuances and benefit payments (12) (21) (9)
Attributed fees collected and interest accrual 93 107 99
Actual policyholder behavior different from expected 20 43 (22)
Changes in assumptions and other 18 (76) 0
Effects of market related movements (133) (231) (108)
Balance, end of period, before effect of changes in the instrument-specific credit risk   102 280
Effect of changes in the instrument-specific credit risk 71 62 146
Balance, end of period $ 159 $ 164 $ 426
Weighted-average attained age of policyholders weighted by total AV (years) 68 years 4 months 2 days 68 years 7 months 2 days 68 years 11 months 12 days
Net amount at risk $ 896 $ 952 $ 1,304
FIA | As Previously Reported      
Market Risk Benefit [Line Items]      
Balance beginning of period     531
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 102 280  
Balance, end of period, before effect of changes in the instrument-specific credit risk 88 102 280
Fixed Rate Annuities      
Market Risk Benefit [Line Items]      
Balance beginning of period 1 2 1
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 1 1 1
Issuances and benefit payments 0 0 0
Attributed fees collected and interest accrual 0 1 1
Actual policyholder behavior different from expected 0 0 0
Changes in assumptions and other 0 0 0
Effects of market related movements 0 (1) (1)
Balance, end of period, before effect of changes in the instrument-specific credit risk   1 1
Effect of changes in the instrument-specific credit risk 0 0 1
Balance, end of period $ 1 $ 1 $ 2
Weighted-average attained age of policyholders weighted by total AV (years) 72 years 9 months 10 days 72 years 10 months 17 days 73 years 1 month 6 days
Net amount at risk $ 2 $ 3 $ 4
Fixed Rate Annuities | As Previously Reported      
Market Risk Benefit [Line Items]      
Balance beginning of period     0
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 1 1  
Balance, end of period, before effect of changes in the instrument-specific credit risk $ 1 $ 1 $ 1