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Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - Commercial mortgage loans - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Loans $ 2,456 $ 2,407
% of Total 100.00% 100.00%
Loans under development, amortized cost $ 9 $ 9
Loans under development, fair value 9 9
Credit Quality Indicator Current Year [Abstract]    
2023 54 341
2022 340 1,300
2021 1,301 488
2020 486 0
2019 0 0
Prior 275 278
Total 2,456 2,407
Credit Quality Indicator Prior Year [Abstract]    
2022 54 341
2021 340 1,300
2020 1,301 488
2019 486 0
2018 0 0
Prior 275 278
Total 2,456 2,407
Fair Value    
Schedule of Investments [Line Items]    
Loans $ 2,165 $ 2,074
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 2,165 $ 2,074
Credit Quality Indicator Prior Year [Abstract]    
Total 2,165 2,074
Less than 50.00%    
Schedule of Investments [Line Items]    
Loans $ 526 $ 526
% of Total 21.00% 22.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 4 $ 70
2022 69 120
2021 120 207
2020 206 0
2019   0
Prior 127 129
Total 526 526
Credit Quality Indicator Prior Year [Abstract]    
2022 4 70
2021 69 120
2020 120 207
2019 206 0
2018   0
Prior 127 129
Total 526 526
Less than 50.00% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 493 $ 490
% of Total 23.00% 24.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 493 $ 490
Credit Quality Indicator Prior Year [Abstract]    
Total 493 490
50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans $ 732 $ 706
% of Total 30.00% 29.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 27 $ 149
2022 149 268
2021 268 158
2020 158 0
2019   0
Prior 130 131
Total 732 706
Credit Quality Indicator Prior Year [Abstract]    
2022 27 149
2021 149 268
2020 268 158
2019 158 0
2018   0
Prior 130 131
Total 732 706
50.00% to 59.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 653 $ 615
% of Total 30.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 653 $ 615
Credit Quality Indicator Prior Year [Abstract]    
Total 653 615
60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans $ 1,178 $ 1,157
% of Total 48.00% 48.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 20 $ 113
2022 113 912
2021 913 123
2020 122 0
2019   0
Prior 10 9
Total 1,178 1,157
Credit Quality Indicator Prior Year [Abstract]    
2022 20 113
2021 113 912
2020 913 123
2019 122 0
2018   0
Prior 10 9
Total 1,178 1,157
60.00% to 74.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 1,002 $ 955
% of Total 46.00% 45.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 1,002 $ 955
Credit Quality Indicator Prior Year [Abstract]    
Total 1,002 955
75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans $ 20 $ 18
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 3 $ 9
2022 9 0
2021 0 0
2020 0 0
2019   0
Prior 8 9
Total 20 18
Credit Quality Indicator Prior Year [Abstract]    
2022 3 9
2021 9 0
2020 0 0
2019 0 0
2018   0
Prior 8 9
Total 20 18
75.00% to 84.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 17 $ 14
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 17 $ 14
Credit Quality Indicator Prior Year [Abstract]    
Total 17 14
Greater than 1.25    
Schedule of Investments [Line Items]    
Loans 2,413 2,371
Credit Quality Indicator Current Year [Abstract]    
2023 47 329
2022 328 1,300
2021 1,301 488
2020 486 0
2019   0
Prior 251 254
Total 2,413 2,371
Credit Quality Indicator Prior Year [Abstract]    
2022 47 329
2021 328 1,300
2020 1,301 488
2019 486 0
2018   0
Prior 251 254
Total 2,413 2,371
Greater than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 511 511
Credit Quality Indicator Current Year [Abstract]    
Total 511 511
Credit Quality Indicator Prior Year [Abstract]    
Total 511 511
Greater than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 732 706
Credit Quality Indicator Current Year [Abstract]    
Total 732 706
Credit Quality Indicator Prior Year [Abstract]    
Total 732 706
Greater than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 1,170 1,154
Credit Quality Indicator Current Year [Abstract]    
Total 1,170 1,154
Credit Quality Indicator Prior Year [Abstract]    
Total 1,170 1,154
Greater than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Greater than 1.00 but less than 1.25    
Schedule of Investments [Line Items]    
Loans 14 7
Credit Quality Indicator Current Year [Abstract]    
2023 7 3
2022 3 0
2021 0 0
2020 0 0
2019   0
Prior 4 4
Total 14 7
Credit Quality Indicator Prior Year [Abstract]    
2022 7 3
2021 3 0
2020 0 0
2019 0 0
2018   0
Prior 4 4
Total 14 7
Greater than 1.00 but less than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 4 4
Credit Quality Indicator Current Year [Abstract]    
Total 4 4
Credit Quality Indicator Prior Year [Abstract]    
Total 4 4
Greater than 1.00 but less than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Greater than 1.00 but less than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 8 3
Credit Quality Indicator Current Year [Abstract]    
Total 8 3
Credit Quality Indicator Prior Year [Abstract]    
Total 8 3
Greater than 1.00 but less than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 2 0
Credit Quality Indicator Current Year [Abstract]    
Total 2 0
Credit Quality Indicator Prior Year [Abstract]    
Total 2 0
Less than 1.00    
Schedule of Investments [Line Items]    
Loans 29 29
Credit Quality Indicator Current Year [Abstract]    
2023 0 9
2022 9 0
2021 0 0
2020 0 0
2019   0
Prior 20 20
Total 29 29
Credit Quality Indicator Prior Year [Abstract]    
2022 0 9
2021 9 0
2020 0 0
2019 0 0
2018   0
Prior 20 20
Total 29 29
Less than 1.00 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 11 11
Credit Quality Indicator Current Year [Abstract]    
Total 11 11
Credit Quality Indicator Prior Year [Abstract]    
Total 11 11
Less than 1.00 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Less than 1.00 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Less than 1.00 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 18 18
Credit Quality Indicator Current Year [Abstract]    
Total 18 18
Credit Quality Indicator Prior Year [Abstract]    
Total $ 18 $ 18