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Investments - Loans Segregated By Risk Rating and Non-accrual Loans by Amortized Cost (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Amortized cost of loans on non-accrual    
Amortized cost of loans on non-accrual $ 73 $ 72
Residential Mortgage    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 900 320
2020 229 375
2019 223 53
2018 24 36
Prior 33 21
Amortized Cost 2,180 1,606
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 771 801
2020 900 320
2019 229 375
2018 223 53
2017 24 36
Prior 33 21
Amortized Cost 2,180 1,606
Amortized cost of loans on non-accrual    
Amortized cost of loans on non-accrual 64 72
Residential Mortgage | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 884 293
2020 214 323
2019 185 50
2018 23 36
Prior 33 21
Amortized Cost 2,105 1,518
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 766 795
2020 884 293
2019 214 323
2018 185 50
2017 23 36
Prior 33 21
Amortized Cost 2,105 1,518
Residential Mortgage | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 7 4
2020 0 6
2019 4 1
2018 0 0
Prior 0 0
Amortized Cost 13 16
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 2 5
2020 7 4
2019 0 6
2018 4 1
2017 0 0
Prior 0 0
Amortized Cost 13 16
Residential Mortgage | 90 days or more past due    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 9 23
2020 15 46
2019 34 2
2018 1 0
Prior 0 0
Amortized Cost 62 72
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 3 1
2020 9 23
2019 15 46
2018 34 2
2017 1 0
Prior 0 0
Amortized Cost 62 72
Commercial Mortgage    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 341  
2021 1,300 543
2020 488 0
2019 0 6
2018 0 0
Prior 278 324
Amortized Cost 2,416 2,174
Financing Receivable 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
Amortized Cost 2,416 2,174
Amortized cost of loans on non-accrual    
Amortized cost of loans on non-accrual 9 0
Commercial Mortgage | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 329  
2021 1,300 543
2020 488 0
2019 0 4
2018 0 0
Prior 254 284
Amortized Cost   2,132
Financing Receivable 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
Amortized Cost   2,132
Commercial Mortgage | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 3  
2021 0 0
2020 0 0
2019 0 2
2018 0 0
Prior 4 31
Amortized Cost   33
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021   0
2020 0 0
2019 0 0
2018 0 2
2017 0 0
Prior 4 31
Amortized Cost   33
Commercial Mortgage | Less than 1.00    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 9  
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 20 9
Amortized Cost   9
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021   0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 20 9
Amortized Cost   9
Commercial Mortgage | Less than 50.00%    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 70  
2021 120 229
2020 207 0
2019 0 6
2018 0 0
Prior 129 313
Amortized Cost   668
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021   120
2020 120 229
2019 207 0
2018 0 6
2017 0 0
Prior 129 313
Amortized Cost   668
Commercial Mortgage | Less than 50.00% | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Amortized Cost   626
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Amortized Cost   626
Commercial Mortgage | Less than 50.00% | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Amortized Cost   33
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Amortized Cost   33
Commercial Mortgage | 50.00% to 59.99%    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 149  
2021 268 192
2020 158 0
2019 0 0
2018 0 0
Prior 131 11
Amortized Cost   470
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021   267
2020 268 192
2019 158 0
2018 0 0
2017 0 0
Prior 131 11
Amortized Cost   470
Commercial Mortgage | 50.00% to 59.99% | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Amortized Cost   470
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Amortized Cost   470
Commercial Mortgage | 50.00% to 59.99% | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Amortized Cost   0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Amortized Cost   0
Commercial Mortgage | 60.00% to 74.99%    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 113  
2021 912 122
2020 123 0
2019 0 0
2018 0 0
Prior 9 0
Amortized Cost   1,036
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021   914
2020 912 122
2019 123 0
2018 0 0
2017 0 0
Prior 9 0
Amortized Cost   1,036
Commercial Mortgage | 60.00% to 74.99% | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Amortized Cost   1,036
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Amortized Cost   1,036
Commercial Mortgage | 60.00% to 74.99% | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Amortized Cost   0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Amortized Cost   0
Commercial Mortgage | 75.00% to 84.99%    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2022 9  
2021 0  
2020 0  
2019 0  
2018 0  
Prior 9  
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 0  
2019 0  
2018 0  
2017 0  
Prior 9  
Commercial Mortgage | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 1,300 543
2020 488 0
2019 0 6
2018 0 0
Prior 269 324
Amortized Cost 2,407 2,174
Financing Receivable 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
Amortized Cost 2,407 2,174
Commercial Mortgage | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Amortized Cost 0 0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Amortized Cost 0 0
Commercial Mortgage | 90 days or more past due    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 9 0
Amortized Cost 9 0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 9 0
Amortized Cost $ 9 $ 0