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Investments - Loans Segregated By Risk Rating and Non-accrual Loans by Amortized Cost (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost of Non-Accrual Loans [Abstract]    
Total non-accrual loans $ 72 $ 99
Residential Mortgage    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 801 339
2020 320 641
2019 375 73
2018 53 42
2017 36 62
Prior 21 2
Total 1,606 1,159
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 801 339
2019 320 641
2018 375 73
2017 53 42
2016 36 62
Prior 21 2
Total 1,606 1,159
Amortized Cost of Non-Accrual Loans [Abstract]    
Total non-accrual loans 72 99
Residential Mortgage | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 795 311
2020 293 545
2019 323 68
2018 50 42
2017 36 62
Prior 21 2
Total 1,518 1,030
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 795 311
2019 293 545
2018 323 68
2017 50 42
2016 36 62
Prior 21 2
Total 1,518 1,030
Residential Mortgage | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 5 2
2020 4 22
2019 6 2
2018 1 0
2017 0 0
Prior 0 0
Total 16 26
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 5 2
2019 4 22
2018 6 2
2017 1 0
2016 0 0
Prior 0 0
Total 16 26
Residential Mortgage | Over 90 days past due    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 1 26
2020 23 74
2019 46 3
2018 2 0
2017 0 0
Prior 0 0
Total   103
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 1 26
2019 23 74
2018 46 3
2017 2 0
2016 0 0
Prior 0 0
Total   103
Commercial Mortgage    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 1,301 542
2020 543 0
2019 0 6
2018 6 0
2017 0 11
Prior 324 346
Total 2,174 905
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 1,301 542
2019 543 0
2018 0 6
2017 6 0
2016 0 11
Prior 324 346
Total 2,174 905
Amortized Cost of Non-Accrual Loans [Abstract]    
Total non-accrual loans 0 0
Commercial Mortgage | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 1,301 542
2020 543 0
2019 0 6
2018 4 0
2017 0 11
Prior 284 319
Total 2,132 878
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 1,301 542
2019 543 0
2018 0 6
2017 4 0
2016 0 11
Prior 284 319
Total 2,132 878
Commercial Mortgage | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 2 0
2017 0 0
Prior 31 27
Total 33 27
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 0 0
2019 0 0
2018 0 0
2017 2 0
2016 0 0
Prior 31 27
Total 33 27
Commercial Mortgage | Less than 1.00    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 9 0
Total 9 0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 0 0
Prior 9 0
Total 9 0
Commercial Mortgage | Less than 50%    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 120 228
2020 229 0
2019 0 6
2018 6 0
2017 0 0
Prior 313 303
Total 668 537
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 120 228
2019 229 0
2018 0 6
2017 6 0
2016 0 0
Prior 313 303
Total 668 537
Commercial Mortgage | Less than 50% | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Total 626 519
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Total 626 519
Commercial Mortgage | Less than 50% | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Total 33 18
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Total 33 18
Commercial Mortgage | LTV 50 to 60 Percent    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 267 192
2020 192 0
2019 0 0
2018 0 0
2017 0 11
Prior 11 43
Total 470 246
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 267 192
2019 192 0
2018 0 0
2017 0 0
2016 0 11
Prior 11 43
Total 470 246
Commercial Mortgage | LTV 50 to 60 Percent | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Total 470 237
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Total 470 237
Commercial Mortgage | LTV 50 to 60 Percent | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Total 0 9
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Total 0 9
Commercial Mortgage | LTV 60 to 75 Percent    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 914 122
2020 122 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total 1,036 122
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 914 122
2019 122 0
2018 0 0
2017 0 0
2016 0 0
Prior 0 0
Total 1,036 122
Commercial Mortgage | LTV 60 to 75 Percent | Greater than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Total 1,036 122
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Total 1,036 122
Commercial Mortgage | LTV 60 to 75 Percent | Greater than 1.00 but less than 1.25    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Commercial Mortgage | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 1,301 542
2020 543 0
2019 0 6
2018 6 0
2017 0 11
Prior 324 346
Total 2,174 905
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 1,301 542
2019 543 0
2018 0 6
2017 6 0
2016 0 11
Prior 324 346
Total 2,174 905
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
2017 0 0
Prior 0 0
Total 0 0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 0 0
Prior 0 0
Total 0 0
Commercial Mortgage | Over 90 days past due    
Financing Receivable Credit Quality Indicator Current Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total 0 0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 0 0
Prior 0 0
Total $ 0 $ 0