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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, 2024 | Dec. 31, 2023
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Schedule of Investments [Line Items] |  |
Total | $ 2,563 | $ 2,528
% of Total | 100.00% | 100.00%
Loans under development, amortized cost | $ 22 | $ 22
Loans under development, fair value | 22 | 22
Credit Quality Indicator Current Year [Abstract] |  |
2024 | 35 | 213
2023 | 214 | 288
2022 | 288 | 1,256
2021 | 1,256 | 512
2020 | 513 | 0
Prior | 257 | 259
Total | 2,563 | 2,528
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 35 | 213
2022 | 214 | 288
2021 | 288 | 1,256
2020 | 1,256 | 512
2019 | 513 | 0
Prior | 257 | 259
Total | 2,563 | 2,528
Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 2,229 | $ 2,231
% of Total | 100.00% | 100.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 2,229 | $ 2,231
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 2,229 | 2,231
Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | $ 493 | $ 533
% of Total | 19.00% | 21.00%
Credit Quality Indicator Current Year [Abstract] |  |
2024 | $ 35 | $ 85
2023 | 86 | 17
2022 | 17 | 77
2021 | 77 | 232
2020 | 156 | 0
Prior | 122 | 122
Total | 493 | 533
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 35 | 85
2022 | 86 | 17
2021 | 17 | 77
2020 | 77 | 232
2019 | 156 | 0
Prior | 122 | 122
Total | 493 | 533
Less than 50.00% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 477 | $ 510
% of Total | 21.00% | 23.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 477 | $ 510
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 477 | 510
50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Total | $ 864 | $ 764
% of Total | 34.00% | 30.00%
Credit Quality Indicator Current Year [Abstract] |  |
2024 | $ 0 | $ 53
2023 | 53 | 149
2022 | 149 | 267
2021 | 292 | 158
2020 | 235 | 0
Prior | 135 | 137
Total | 864 | 764
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 0 | 53
2022 | 53 | 149
2021 | 149 | 267
2020 | 292 | 158
2019 | 235 | 0
Prior | 135 | 137
Total | 864 | 764
50.00% to 59.99% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 754 | $ 679
% of Total | 34.00% | 30.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 754 | $ 679
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 754 | 679
60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Total | $ 1,191 | $ 1,216
% of Total | 46.00% | 48.00%
Credit Quality Indicator Current Year [Abstract] |  |
2024 | $ 0 | $ 69
2023 | 69 | 113
2022 | 113 | 912
2021 | 887 | 122
2020 | 122 | 0
Prior | 0 | 0
Total | 1,191 | 1,216
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 0 | 69
2022 | 69 | 113
2021 | 113 | 912
2020 | 887 | 122
2019 | 122 | 0
Prior | 0 | 0
Total | 1,191 | 1,216
60.00% to 74.99% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 983 | $ 1,028
% of Total | 44.00% | 46.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 983 | $ 1,028
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 983 | 1,028
75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Total | $ 15 | $ 15
% of Total | 1.00% | 1.00%
Credit Quality Indicator Current Year [Abstract] |  |
2024 | $ 0 | $ 6
2023 | 6 | 9
2022 | 9 | 0
2021 | 0 | 0
2020 | 0 | 0
Prior | 0 | 0
Total | 15 | 15
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 0 | 6
2022 | 6 | 9
2021 | 9 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 0 | 0
Total | 15 | 15
75.00% to 84.99% | Fair Value |  |
Schedule of Investments [Line Items] |  |
Total | $ 15 | $ 14
% of Total | 1.00% | 1.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 15 | $ 14
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 15 | 14
Greater than 1.25 |  |
Schedule of Investments [Line Items] |  |
Total | 2,477 | 2,443
Credit Quality Indicator Current Year [Abstract] |  |
2024 | 35 | 154
2023 | 154 | 276
2022 | 276 | 1,256
2021 | 1,256 | 512
2020 | 513 | 0
Prior | 243 | 245
Total | 2,477 | 2,443
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 35 | 154
2022 | 154 | 276
2021 | 276 | 1,256
2020 | 1,256 | 512
2019 | 513 | 0
Prior | 243 | 245
Total | 2,477 | 2,443
Greater than 1.25 | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | 479 | 519
Credit Quality Indicator Current Year [Abstract] |  |
Total | 479 | 519
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 479 | 519
Greater than 1.25 | 50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Total | 864 | 764
Credit Quality Indicator Current Year [Abstract] |  |
Total | 864 | 764
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 864 | 764
Greater than 1.25 | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Total | 1,134 | 1,160
Credit Quality Indicator Current Year [Abstract] |  |
Total | 1,134 | 1,160
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 1,134 | 1,160
Greater than 1.25 | 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 |  |
Schedule of Investments [Line Items] |  |
Total | 63 | 66
Credit Quality Indicator Current Year [Abstract] |  |
2024 | 0 | 59
2023 | 60 | 3
2022 | 3 | 0
2021 | 0 | 0
2020 | 0 | 0
Prior | 0 | 4
Total | 63 | 66
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 0 | 59
2022 | 60 | 3
2021 | 3 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 0 | 4
Total | 63 | 66
Greater than 1.00 but less than 1.25 | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | 0 | 4
Credit Quality Indicator Current Year [Abstract] |  |
Total | 0 | 4
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 0 | 4
Greater than 1.00 but less than 1.25 | 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 | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Total | 57 | 56
Credit Quality Indicator Current Year [Abstract] |  |
Total | 57 | 56
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 57 | 56
Greater than 1.00 but less than 1.25 | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Total | 6 | 6
Credit Quality Indicator Current Year [Abstract] |  |
Total | 6 | 6
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 6 | 6
Less than 1.00 |  |
Schedule of Investments [Line Items] |  |
Total | 23 | 19
Credit Quality Indicator Current Year [Abstract] |  |
2024 | 0 | 0
2023 | 0 | 9
2022 | 9 | 0
2021 | 0 | 0
2020 | 0 | 0
Prior | 14 | 10
Total | 23 | 19
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 0 | 0
2022 | 0 | 9
2021 | 9 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 14 | 10
Total | 23 | 19
Less than 1.00 | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Total | 14 | 10
Credit Quality Indicator Current Year [Abstract] |  |
Total | 14 | 10
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 14 | 10
Less than 1.00 | 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 | 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 | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Total | 9 | 9
Credit Quality Indicator Current Year [Abstract] |  |
Total | 9 | 9
Credit Quality Indicator Prior Year [Abstract] |  |
Total | $ 9 | $ 9

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