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Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Investments [Line Items] |  |
Loans under development, amortized cost | $ 21 |
Loans under development, fair value | 21 |
Commercial mortgage loans |  |
Schedule of Investments [Line Items] |  |
Total | $ 2,513 | $ 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 | 171 | 341
2022 | 327 | 1,300
2021 | 1,145 | 488
2020 | 599 | 0
2019 | 0 | 0
Prior | 271 | 278
Total | 2,513 | 2,407
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 171 | 341
2021 | 327 | 1,300
2020 | 1,145 | 488
2019 | 599 | 0
2018 | 0 | 0
Prior | 271 | 278
Total | 2,513 | 2,407
Commercial mortgage loans | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 2,127 | $ 2,074
% of Total | 100.00% | 100.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 2,127 | $ 2,074
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 2,127 | 2,074
Commercial mortgage loans | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | $ 541 | $ 526
% of Total | 22.00% | 22.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 52 | $ 70
2022 | 111 | 120
2021 | 157 | 207
2020 | 97 | 0
2019 | 0 | 0
Prior | 124 | 129
Total | 541 | 526
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 52 | 70
2021 | 111 | 120
2020 | 157 | 207
2019 | 97 | 0
2018 | 0 | 0
Prior | 124 | 129
Total | 541 | 526
Commercial mortgage loans | Less than 50.00% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 505 | $ 490
% of Total | 24.00% | 24.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 505 | $ 490
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 505 | 490
Commercial mortgage loans | 50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Total | $ 765 | $ 706
% of Total | 31.00% | 29.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 78 | $ 149
2022 | 126 | 268
2021 | 294 | 158
2020 | 129 | 0
2019 | 0 | 0
Prior | 138 | 131
Total | 765 | 706
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 78 | 149
2021 | 126 | 268
2020 | 294 | 158
2019 | 129 | 0
2018 | 0 | 0
Prior | 138 | 131
Total | 765 | 706
Commercial mortgage loans | 50.00% to 59.99% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 654 | $ 615
% of Total | 31.00% | 30.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 654 | $ 615
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 654 | 615
Commercial mortgage loans | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Total | $ 1,187 | $ 1,157
% of Total | 47.00% | 48.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 39 | $ 113
2022 | 81 | 912
2021 | 694 | 123
2020 | 373 | 0
2019 | 0 | 0
Prior | 0 | 9
Total | 1,187 | 1,157
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 39 | 113
2021 | 81 | 912
2020 | 694 | 123
2019 | 373 | 0
2018 | 0 | 0
Prior | 0 | 9
Total | 1,187 | 1,157
Commercial mortgage loans | 60.00% to 74.99% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 952 | $ 955
% of Total | 45.00% | 45.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 952 | $ 955
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 952 | 955
Commercial mortgage loans | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Total | $ 11 | $ 18
% of Total | 0.00% | 1.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 2 | $ 9
2022 | 9 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 0 | 9
Total | 11 | 18
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 2 | 9
2021 | 9 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 0 | 9
Total | 11 | 18
Commercial mortgage loans | 75.00% to 84.99% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 10 | $ 14
% of Total | 0.00% | 1.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 10 | $ 14
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 10 | 14
Greater than 1.25 | Commercial mortgage loans |  |
Schedule of Investments [Line Items] |  |
Total | 2,452 | 2,371
Credit Quality Indicator Current Year [Abstract] |  |
2023 | 146 | 329
2022 | 315 | 1,300
2021 | 1,145 | 488
2020 | 599 | 0
2019 | 0 | 0
Prior | 247 | 254
Total | 2,452 | 2,371
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 146 | 329
2021 | 315 | 1,300
2020 | 1,145 | 488
2019 | 599 | 0
2018 | 0 | 0
Prior | 247 | 254
Total | 2,452 | 2,371
Greater than 1.25 | Commercial mortgage loans | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | 527 | 511
Credit Quality Indicator Current Year [Abstract] |  |
Total | 527 | 511
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 527 | 511
Greater than 1.25 | Commercial mortgage loans | 50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Total | 765 | 706
Credit Quality Indicator Current Year [Abstract] |  |
Total | 765 | 706
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 765 | 706
Greater than 1.25 | Commercial mortgage loans | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Total | 1,160 | 1,154
Credit Quality Indicator Current Year [Abstract] |  |
Total | 1,160 | 1,154
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 1,160 | 1,154
Greater than 1.25 | Commercial mortgage loans | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Total | 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 | Commercial mortgage loans |  |
Schedule of Investments [Line Items] |  |
Total | 33 | 7
Credit Quality Indicator Current Year [Abstract] |  |
2023 | 25 | 3
2022 | 3 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 5 | 4
Total | 33 | 7
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 25 | 3
2021 | 3 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 5 | 4
Total | 33 | 7
Greater than 1.00 but less than 1.25 | Commercial mortgage loans | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | 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 | Commercial mortgage loans | 50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Total | 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 | Commercial mortgage loans | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Total | 27 | 3
Credit Quality Indicator Current Year [Abstract] |  |
Total | 27 | 3
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 27 | 3
Greater than 1.00 but less than 1.25 | Commercial mortgage loans | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Total | 2 | 0
Credit Quality Indicator Current Year [Abstract] |  |
Total | 2 | 0
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 2 | 0
Less than 1.00 | Commercial mortgage loans |  |
Schedule of Investments [Line Items] |  |
Total | 28 | 29
Credit Quality Indicator Current Year [Abstract] |  |
2023 | 0 | 9
2022 | 9 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 19 | 20
Total | 28 | 29
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 0 | 9
2021 | 9 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 19 | 20
Total | 28 | 29
Less than 1.00 | Commercial mortgage loans | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | 10 | 11
Credit Quality Indicator Current Year [Abstract] |  |
Total | 10 | 11
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 10 | 11
Less than 1.00 | Commercial mortgage loans | 50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Total | 0 | 0
Credit Quality Indicator Current Year [Abstract] |  |
Total | 0 | 0
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 0 | 0
Less than 1.00 | Commercial mortgage loans | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Total | 0 | 0
Credit Quality Indicator Current Year [Abstract] |  |
Total | 0 | 0
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 0 | 0
Less than 1.00 | Commercial mortgage loans | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Total | 9 | 18
Credit Quality Indicator Current Year [Abstract] |  |
Total | 9 | 18
Credit Quality Indicator Prior Year [Abstract] |  |
Total | $ 9 | $ 18

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