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Investments - Investments - ACL on Fixed Maturities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance $ 17 $ 13 $ 12 $ 1
Credit losses on fixed maturities where credit losses were not previously recorded 2 0 6 12
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period 1 0 2 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance 18 13 18 13
Reduction due to sales (2) 0 (2) 0
Corporate        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance 6 9 2 1
Credit losses on fixed maturities where credit losses were not previously recorded 2 0 6 8
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period 0 (1) 0 (1)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance 6 8 6 8
Reduction due to sales (2) 0 (2) 0
Foreign Govt./Govt. Agencies        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance   3 0 0
Credit losses on fixed maturities where credit losses were not previously recorded   0   3
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period   1   1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance 0 4 0 4
Reduction due to sales   0   0
CMBS        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance 11 1 10 0
Credit losses on fixed maturities where credit losses were not previously recorded 0 0 0 1
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period 1 0 2 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance 12 1 12 1
Reduction due to sales $ 0 $ 0 $ 0 $ 0