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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

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