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Investments - Schedule of Residential Loans Segregated by Risk Rating Exposure and Non-accrual Loans by Amortized Cost (Details) - Residential Mortgage - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Credit Quality Indicator Current Year [Abstract]    
2023 $ 373 $ 771
2022 995 900
2021 877 229
2020 208 223
2019 204 24
Prior 195 33
Total 2,852 2,180
Credit Quality Indicator Prior Year [Abstract]    
2022 373 771
2021 995 900
2020 877 229
2019 208 223
2018 204 24
Prior 195 33
Total 2,852 2,180
Current (less than 30 days past due)    
Credit Quality Indicator Current Year [Abstract]    
2023 373 766
2022 985 884
2021 854 214
2020 192 185
2019 183 23
Prior 192 33
Total 2,779 2,105
Credit Quality Indicator Prior Year [Abstract]    
2022 373 766
2021 985 884
2020 854 214
2019 192 185
2018 183 23
Prior 192 33
Total 2,779 2,105
30-89 days past due    
Credit Quality Indicator Current Year [Abstract]    
2023 0 2
2022 4 7
2021 7 0
2020 3 4
2019 0 0
Prior 2 0
Total 16 13
Credit Quality Indicator Prior Year [Abstract]    
2022 0 2
2021 4 7
2020 7 0
2019 3 4
2018 0 0
Prior 2 0
Total 16 13
90 days or more past due    
Credit Quality Indicator Current Year [Abstract]    
2023 0 3
2022 6 9
2021 16 15
2020 13 34
2019 21 1
Prior 1 0
Total 57 62
Credit Quality Indicator Prior Year [Abstract]    
2022 0 3
2021 6 9
2020 16 15
2019 13 34
2018 21 1
Prior 1 0
Total $ 57 $ 62