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Investments - Loans Segregated by Risk Rating (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Amortized cost of loans on non-accrual    
Total non-accrual loans $ 80 $ 99
Residential mortgages    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 633 339
2020 353 641
2019 421 73
2018 59 42
2017 37 62
Prior 21 2
Total 1,524 1,159
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 633 339
2019 353 641
2018 421 73
2017 59 42
2016 37 62
Prior 21 2
Total 1,524 1,159
Amortized cost of loans on non-accrual    
Total non-accrual loans 80 99
Residential mortgages | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 623 311
2020 310 545
2019 334 68
2018 56 42
2017 36 62
Prior 19 2
Total 1,378 1,030
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 623 311
2019 310 545
2018 334 68
2017 56 42
2016 36 62
Prior 19 2
Total 1,378 1,030
Residential mortgages | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 10 2
2020 14 22
2019 39 2
2018 0 0
2017 1 0
Prior 2 0
Total 66 26
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 10 2
2019 14 22
2018 39 2
2017 0 0
2016 1 0
Prior 2 0
Total 66 26
Residential mortgages | Over 90 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 0 26
2020 29 74
2019 48 3
2018 3 0
2017 0 0
Prior 0 0
Total 80 103
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 0 26
2019 29 74
2018 48 3
2017 3 0
2016 0 0
Prior 0 0
Total 80 103
Commercial mortgages    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 1,111 542
2020 543 0
2019 0 6
2018 6 0
2017 0 11
Prior 330 346
Total 1,990 905
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 1,111 542
2019 543 0
2018 0 6
2017 6 0
2016 0 11
Prior 330 346
Total 1,990 905
Amortized cost of loans on non-accrual    
Total non-accrual loans 0 0
Commercial mortgages | Greater than 1.25x    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 1,079 542
2020 417 0
2019 0 6
2018 4 0
2017 0 11
Prior 290 319
Total 1,790 878
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 1,079 542
2019 417 0
2018 0 6
2017 4 0
2016 0 11
Prior 290 319
Total 1,790 878
Commercial mortgages | 1.00x - 1.25x    
Financing Receivable Credit Quality Indicator Current Year Abstract [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 mortgages | Less than 1.00x    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 32 0
2020 126 0
2019 0 0
2018 0 0
2017 0 0
Prior 9 0
Total 167 0
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 32 0
2019 126 0
2018 0 0
2017 0 0
2016 0 0
Prior 9 0
Total 167 0
Commercial mortgages | LTV Less Than 50 %    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 85 228
2020 229 0
2019 0 6
2018 6 0
2017 0 0
Prior 320 303
Total 640 537
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 85 228
2019 229 0
2018 0 6
2017 6 0
2016 0 0
Prior 320 303
Total 640 537
Commercial mortgages | LTV 50 to 60%    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 184 192
2020 192 0
2019 0 0
2018 0 0
2017 0 11
Prior 10 43
Total 386 246
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 184 192
2019 192 0
2018 0 0
2017 0 0
2016 0 11
Prior 10 43
Total 386 246
Commercial mortgages | LTV 60% to 75%    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 842 122
2020 122 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total 964 122
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 842 122
2019 122 0
2018 0 0
2017 0 0
2016 0 0
Prior 0 0
Total 964 122
Commercial mortgages | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 1,111 542
2020 543 0
2019 0 6
2018 6 0
2017 0 11
Prior 330 346
Total 1,990 905
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 1,111 542
2019 543 0
2018 0 6
2017 6 0
2016 0 11
Prior 330 346
Total 1,990 905
Commercial mortgages | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [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 mortgages | Over 90 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [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