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Investments - Loans Segregated by Risk Rating (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Amortized cost of loans on non-accrual    
Total non-accrual loans $ 63 $ 72
Residential mortgages    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 377 801
2021 927 320
2020 285 375
2019 333 53
2018 40 36
Prior 48 21
Total 2,010 1,606
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 377 801
2020 927 320
2019 285 375
2018 333 53
2017 40 36
Prior 48 21
Total 2,010 1,606
Amortized cost of loans on non-accrual    
Total non-accrual loans 63 72
Residential mortgages | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 377 795
2021 916 293
2020 264 323
2019 276 50
2018 38 36
Prior 48 21
Total 1,919 1,518
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 377 795
2020 916 293
2019 264 323
2018 276 50
2017 38 36
Prior 48 21
Total 1,919 1,518
Residential mortgages | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 0 5
2021 10 4
2020 6 6
2019 12 1
2018 0 0
Prior 0 0
Total 28 16
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 0 5
2020 10 4
2019 6 6
2018 12 1
2017 0 0
Prior 0 0
Total 28 16
Residential mortgages | Over 90 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 0 1
2021 1 23
2020 15 46
2019 45 2
2018 2 0
Prior 0 0
Total 63 72
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 0 1
2020 1 23
2019 15 46
2018 45 2
2017 2 0
Prior 0 0
Total 63 72
Commercial mortgages    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 89 1,301
2021 1,301 543
2020 543 0
2019 0 6
2018 0 0
Prior 304 324
Total 2,237 2,174
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 89 1,301
2020 1,301 543
2019 543 0
2018 0 6
2017 0 0
Prior 304 324
Total 2,237 2,174
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]    
2022 89 1,301
2021 1,301 543
2020 543 0
2019 0 4
2018 0 0
Prior 265 284
Total 2,198 2,132
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 89 1,301
2020 1,301 543
2019 543 0
2018 0 4
2017 0 0
Prior 265 284
Total 2,198 2,132
Commercial mortgages | 1.00x - 1.25x    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 0 0
2021 0 0
2020 0 0
2019 0 2
2018 0 0
Prior 30 31
Total 30 33
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 0 0
2020 0 0
2019 0 0
2018 0 2
2017 0 0
Prior 30 31
Total 30 33
Commercial mortgages | Less than 1.00x    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 9 9
Total 9 9
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 9
Total 9 9
Commercial mortgages | LTV Less Than 50 %    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 4 120
2021 120 229
2020 229 0
2019 0 6
2018 0 0
Prior 285 313
Total 638 668
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 4 120
2020 120 229
2019 229 0
2018 0 6
2017 0 0
Prior 285 313
Total 638 668
Commercial mortgages | LTV 50 to 60%    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 43 267
2021 267 192
2020 192 0
2019 0 0
2018 0 0
Prior 10 11
Total 512 470
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 43 267
2020 267 192
2019 192 0
2018 0 0
2017 0 0
Prior 10 11
Total 512 470
Commercial mortgages | LTV 60% to 75%    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 42 914
2021 914 122
2020 122 0
2019 0 0
2018 0 0
Prior 0 0
Total 1,078 1,036
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 42 914
2020 914 122
2019 122 0
2018 0 0
2017 0 0
Prior 0 0
Total 1,078 1,036
Commercial mortgages | LTV 75% to 85%    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 0  
2021 0  
2020 0  
2019 0  
2018 0  
Prior 9  
Total 9  
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 9  
Total 9  
Commercial mortgages | Current (less than 30 days past due)    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 89 1,301
2021 1,301 543
2020 543 0
2019 0 6
2018 0 0
Prior 295 324
Total 2,228 2,174
Financing Receivable Credit Quality Indicator Prior Year [Abstract]    
2021 89 1,301
2020 1,301 543
2019 543 0
2018 0 6
2017 0 0
Prior 295 324
Total 2,228 2,174
Commercial mortgages | 30-89 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 9 0
Total 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
Total 9 0
Commercial mortgages | Over 90 days past due    
Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total 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
Total $ 0 $ 0