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Investments - Loans Segregated by Risk Rating (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Amortized cost of loans on non-accrual    
Total non-accrual loans $ 89 $ 99
Residential mortgages    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 293 339
2020 525 641
2019 306 73
2018 108 42
2017 0 62
Prior 0 2
Total 1,232 1,159
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 293 339
2019 525 641
2018 306 73
2017 108 42
2016 0 62
Prior 0 2
Amortized cost of loans on non-accrual    
Total non-accrual loans 89 99
Residential mortgages | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 281 311
2020 463 545
2019 245 68
2018 100 42
2017 0 62
Prior 0 2
Total 1,089 1,030
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 281 311
2019 463 545
2018 245 68
2017 100 42
2016 0 62
Prior 0 2
Residential mortgages | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 6 2
2020 27 22
2019 16 2
2018 5 0
2017 0 0
Prior 0 0
Total 54 26
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 6 2
2019 27 22
2018 16 2
2017 5 0
2016 0 0
Prior 0 0
Residential mortgages | Over 90 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 6 26
2020 35 74
2019 45 3
2018 3 0
2017 0 0
Prior 0 0
Total 89 103
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 6 26
2019 35 74
2018 45 3
2017 3 0
2016 0 0
Prior 0 0
Commercial mortgages    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 710 542
2020 542 0
2019 0 6
2018 6 0
2017 0 11
Prior 333 346
Total 1,591 905
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 710 542
2019 542 0
2018 0 6
2017 6 0
2016 0 11
Prior 333 346
Total 1,591 905
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 710 542
2020 542 0
2019 0 6
2018 6 0
2017 0 11
Prior 293 319
Total 1,551 878
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 710 542
2019 542 0
2018 0 6
2017 6 0
2016 0 11
Prior 293 319
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 0 0
2017 0 0
Prior 31 27
Total 31 27
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 0 0
Prior 31 27
Commercial mortgages | Less than 1.00x    
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 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
Commercial mortgages | LTV Less Than 50 %    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 52 228
2020 228 0
2019 0 6
2018 6 0
2017 0 0
Prior 313 303
Total 599 538
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 52 228
2019 228 0
2018 0 6
2017 6 0
2016 0 0
Prior 313 303
Total 599 538
Commercial mortgages | LTV 50 to 60%    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 101 192
2020 192 0
2019 0 0
2018 0 0
2017 0 11
Prior 20 43
Total 313 246
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 101 192
2019 192 0
2018 0 0
2017 0 0
2016 0 11
Prior 20 43
Total 313 246
Commercial mortgages | LTV 60% to 75%    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 557 122
2020 122 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total 679 121
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 557 122
2019 122 0
2018 0 0
2017 0 0
2016 0 0
Prior 0 0
Total 679 121
Commercial mortgages | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2021 710 542
2020 542 0
2019 0 6
2018 6 0
2017 0 11
Prior 333 346
Total 1,591 905
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2020 710 542
2019 542 0
2018 0 6
2017 6 0
2016 0 11
Prior 333 346
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
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