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Investments - Schedule of Loans Segregated by Risk Rating Exposure and Non-accrual Loans by Amortized Cost (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Amortized Cost of Non-Accrual Loans [Abstract]    
Amortized cost of loans on non-accrual $ 71 $ 72
Residential mortgages    
Credit Quality Indicator Current Year [Abstract]    
2021 900 320
2020 229 375
2019 223 53
2018 24 36
Prior 33 21
Credit Quality Indicator Prior Year [Abstract]    
2021 771 801
2020 900 320
2019 229 375
2018 223 53
2017 24 36
Prior 33 21
Total 2,180 1,606
Amortized Cost of Non-Accrual Loans [Abstract]    
Amortized cost of loans on non-accrual 62 72
Commercial mortgages    
Credit Quality Indicator Current Year [Abstract]    
2022 341  
2021 1,300 543
2020 488 0
2019 0 6
2018 0 0
Prior 278 324
Total 2,407  
Credit Quality Indicator Prior Year [Abstract]    
2021 350 1,301
2020 1,300 543
2019 488 0
2018 0 6
2017 0 0
Prior 278 324
Total 2,416 2,174
Amortized Cost of Non-Accrual Loans [Abstract]    
Amortized cost of loans on non-accrual 9 0
Commercial mortgages | Greater than 1.25    
Credit Quality Indicator Current Year [Abstract]    
2022 329  
2021 1,300 543
2020 488 0
2019 0 4
2018 0 0
Prior 254 284
Total 2,371  
Credit Quality Indicator Prior Year [Abstract]    
2021   1,301
2020 1,300 543
2019 488 0
2018 0 4
2017 0 0
Prior 254 284
Total   2,132
Commercial mortgages | Greater than 1.00 but less than 1.25    
Credit Quality Indicator Current Year [Abstract]    
2022 3  
2021 0 0
2020 0 0
2019 0 2
2018 0 0
Prior 4 31
Total 7  
Credit Quality Indicator Prior Year [Abstract]    
2021   0
2020 0 0
2019 0 0
2018 0 2
2017 0 0
Prior 4 31
Total   33
Commercial mortgages | Less than 1.00    
Credit Quality Indicator Current Year [Abstract]    
2022 9  
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 20 9
Total 29  
Credit Quality Indicator Prior Year [Abstract]    
2021   0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 20 9
Total   9
Commercial mortgages | Less than 50.00%    
Credit Quality Indicator Current Year [Abstract]    
2022 70  
2021 120 229
2020 207 0
2019 0 6
2018 0 0
Prior 129 313
Total 526  
Credit Quality Indicator Prior Year [Abstract]    
2021   120
2020 120 229
2019 207 0
2018 0 6
2017 0 0
Prior 129 313
Total   668
Commercial mortgages | Less than 50.00% | Greater than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 511  
Credit Quality Indicator Prior Year [Abstract]    
Total   626
Commercial mortgages | Less than 50.00% | Greater than 1.00 but less than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 4  
Credit Quality Indicator Prior Year [Abstract]    
Total   33
Commercial mortgages | Less than 50.00% | Less than 1.00    
Credit Quality Indicator Current Year [Abstract]    
Total 11  
Credit Quality Indicator Prior Year [Abstract]    
Total   9
Commercial mortgages | 50.00% to 59.99%    
Credit Quality Indicator Current Year [Abstract]    
2022 149  
2021 268 192
2020 158 0
2019 0 0
2018 0 0
Prior 131 11
Total 706  
Credit Quality Indicator Prior Year [Abstract]    
2021   267
2020 268 192
2019 158 0
2018 0 0
2017 0 0
Prior 131 11
Total   470
Commercial mortgages | 50.00% to 59.99% | Greater than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 706  
Credit Quality Indicator Prior Year [Abstract]    
Total   470
Commercial mortgages | 50.00% to 59.99% | Greater than 1.00 but less than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 0  
Credit Quality Indicator Prior Year [Abstract]    
Total   0
Commercial mortgages | 50.00% to 59.99% | Less than 1.00    
Credit Quality Indicator Current Year [Abstract]    
Total 0  
Credit Quality Indicator Prior Year [Abstract]    
Total   0
Commercial mortgages | 60.00% to 74.99%    
Credit Quality Indicator Current Year [Abstract]    
2022 113  
2021 912 122
2020 123 0
2019 0 0
2018 0 0
Prior 9 0
Total 1,157  
Credit Quality Indicator Prior Year [Abstract]    
2021   914
2020 912 122
2019 123 0
2018 0 0
2017 0 0
Prior 9 0
Total   1,036
Commercial mortgages | 60.00% to 74.99% | Greater than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 1,154  
Credit Quality Indicator Prior Year [Abstract]    
Total   1,036
Commercial mortgages | 60.00% to 74.99% | Greater than 1.00 but less than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 3  
Credit Quality Indicator Prior Year [Abstract]    
Total   0
Commercial mortgages | 60.00% to 74.99% | Less than 1.00    
Credit Quality Indicator Current Year [Abstract]    
Total 0  
Credit Quality Indicator Prior Year [Abstract]    
Total   0
Commercial mortgages | 75.00% to 84.99%    
Credit Quality Indicator Current Year [Abstract]    
2022 9  
2021 0  
2020 0  
2019 0  
2018 0  
Prior 9  
Total 18  
Credit Quality Indicator Prior Year [Abstract]    
2020 0  
2019 0  
2018 0  
2017 0  
Prior 9  
Commercial mortgages | 75.00% to 84.99% | Greater than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 0  
Commercial mortgages | 75.00% to 84.99% | Greater than 1.00 but less than 1.25    
Credit Quality Indicator Current Year [Abstract]    
Total 0  
Commercial mortgages | 75.00% to 84.99% | Less than 1.00    
Credit Quality Indicator Current Year [Abstract]    
Total 18  
Financial Asset, 1 to 29 Days Past Due | Residential mortgages    
Credit Quality Indicator Current Year [Abstract]    
2021 884 293
2020 214 323
2019 185 50
2018 23 36
Prior 33 21
Credit Quality Indicator Prior Year [Abstract]    
2021 766 795
2020 884 293
2019 214 323
2018 185 50
2017 23 36
Prior 33 21
Total 2,105 1,518
Financial Asset, 1 to 29 Days Past Due | Commercial mortgages    
Credit Quality Indicator Current Year [Abstract]    
2021 1,300 543
2020 488 0
2019 0 6
2018 0 0
Prior 269 324
Credit Quality Indicator Prior Year [Abstract]    
2021 350 1,301
2020 1,300 543
2019 488 0
2018 0 6
2017 0 0
Prior 269 324
Total 2,407 2,174
Financial Asset, 30 to 89 Days Past Due | Residential mortgages    
Credit Quality Indicator Current Year [Abstract]    
2021 7 4
2020 0 6
2019 4 1
2018 0 0
Prior 0 0
Credit Quality Indicator Prior Year [Abstract]    
2021 2 5
2020 7 4
2019 0 6
2018 4 1
2017 0 0
Prior 0 0
Total 13 16
Financial Asset, 30 to 89 Days Past Due | Commercial mortgages    
Credit Quality Indicator Current Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Credit Quality Indicator Prior Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total 0 0
90 days or over past due | Residential mortgages    
Credit Quality Indicator Current Year [Abstract]    
2021 9 23
2020 15 46
2019 34 2
2018 1 0
Prior 0 0
Credit Quality Indicator Prior Year [Abstract]    
2021 3 1
2020 9 23
2019 15 46
2018 34 2
2017 1 0
Prior 0 0
Total 62 72
90 days or over past due | Commercial mortgages    
Credit Quality Indicator Current Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 9 0
Credit Quality Indicator Prior Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 9 0
Total $ 9 $ 0