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Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Credit Quality Indicator Prior Year [Abstract] |  |
Loans under development, amortized cost |  | $ 9
Loans under development, fair value |  | 9
Commercial Mortgage |  |
Schedule of Investments [Line Items] |  |
Loans | $ 2,528 | $ 2,407
% of Total | 100.00% | 100.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 213 | $ 341
2022 | 288 | 1,300
2021 | 1,256 | 488
2020 | 512 | 0
2019 | 0 | 0
Prior | 259 | 278
Total | 2,528 | 2,407
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 213 | 341
2021 | 288 | 1,300
2020 | 1,256 | 488
2019 | 512 | 0
2018 | 0 | 0
Prior | 259 | 278
Total | 2,528 | 2,407
Loans under development, amortized cost | 22 |
Loans under development, fair value | 22 |
Commercial Mortgage | Total Estimated Fair Value |  |
Schedule of Investments [Line Items] |  |
Loans | $ 2,231 | $ 2,074
% of Total | 100.00% | 100.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 2,231 | $ 2,074
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 2,231 | 2,074
Commercial Mortgage | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Loans | $ 533 | $ 526
% of Total | 21.00% | 22.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 85 | $ 70
2022 | 17 | 120
2021 | 77 | 207
2020 | 232 | 0
2019 | 0 | 0
Prior | 122 | 129
Total | 533 | 526
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 85 | 70
2021 | 17 | 120
2020 | 77 | 207
2019 | 232 | 0
2018 | 0 | 0
Prior | 122 | 129
Total | 533 | 526
Commercial Mortgage | Less than 50.00% | Total Estimated Fair Value |  |
Schedule of Investments [Line Items] |  |
Loans | $ 510 | $ 490
% of Total | 23.00% | 24.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 510 | $ 490
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 510 | 490
Commercial Mortgage | 50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Loans | $ 764 | $ 706
% of Total | 30.00% | 29.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 53 | $ 149
2022 | 149 | 268
2021 | 267 | 158
2020 | 158 | 0
2019 | 0 | 0
Prior | 137 | 131
Total | 764 | 706
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 53 | 149
2021 | 149 | 268
2020 | 267 | 158
2019 | 158 | 0
2018 | 0 | 0
Prior | 137 | 131
Total | 764 | 706
Commercial Mortgage | 50.00% to 59.99% | Total Estimated Fair Value |  |
Schedule of Investments [Line Items] |  |
Loans | $ 679 | $ 615
% of Total | 30.00% | 30.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 679 | $ 615
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 679 | 615
Commercial Mortgage | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Loans | $ 1,216 | $ 1,157
% of Total | 48.00% | 48.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 69 | $ 113
2022 | 113 | 912
2021 | 912 | 123
2020 | 122 | 0
2019 | 0 | 0
Prior | 0 | 9
Total | 1,216 | 1,157
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 69 | 113
2021 | 113 | 912
2020 | 912 | 123
2019 | 122 | 0
2018 | 0 | 0
Prior | 0 | 9
Total | 1,216 | 1,157
Commercial Mortgage | 60.00% to 74.99% | Total Estimated Fair Value |  |
Schedule of Investments [Line Items] |  |
Loans | $ 1,028 | $ 955
% of Total | 46.00% | 45.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 1,028 | $ 955
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 1,028 | 955
Commercial Mortgage | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Loans | $ 15 | $ 18
% of Total | 1.00% | 1.00%
Credit Quality Indicator Current Year [Abstract] |  |
2023 | $ 6 | $ 9
2022 | 9 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 0 | 9
Total | 15 | 18
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 6 | 9
2021 | 9 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 0 | 9
Total | 15 | 18
Commercial Mortgage | 75.00% to 84.99% | Total Estimated Fair Value |  |
Schedule of Investments [Line Items] |  |
Loans | $ 14 | $ 14
% of Total | 1.00% | 1.00%
Credit Quality Indicator Current Year [Abstract] |  |
Total | $ 14 | $ 14
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 14 | 14
Greater than 1.25 | Commercial Mortgage |  |
Schedule of Investments [Line Items] |  |
Loans | 2,443 | 2,371
Credit Quality Indicator Current Year [Abstract] |  |
2023 | 154 | 329
2022 | 276 | 1,300
2021 | 1,256 | 488
2020 | 512 | 0
2019 | 0 | 0
Prior | 245 | 254
Total | 2,443 | 2,371
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 154 | 329
2021 | 276 | 1,300
2020 | 1,256 | 488
2019 | 512 | 0
2018 | 0 | 0
Prior | 245 | 254
Total | 2,443 | 2,371
Greater than 1.25 | Commercial Mortgage | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Loans | 519 | 511
Credit Quality Indicator Current Year [Abstract] |  |
Total | 519 | 511
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 519 | 511
Greater than 1.25 | Commercial Mortgage | 50.00% to 59.99% |  |
Schedule of Investments [Line Items] |  |
Loans | 764 | 706
Credit Quality Indicator Current Year [Abstract] |  |
Total | 764 | 706
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 764 | 706
Greater than 1.25 | Commercial Mortgage | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Loans | 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 | 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 | Commercial Mortgage |  |
Schedule of Investments [Line Items] |  |
Loans | 66 | 7
Credit Quality Indicator Current Year [Abstract] |  |
2023 | 59 | 3
2022 | 3 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 4 | 4
Total | 66 | 7
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 59 | 3
2021 | 3 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 4 | 4
Total | 66 | 7
Greater than 1.00 but less than 1.25 | Commercial Mortgage | 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 | Commercial Mortgage | 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 | Commercial Mortgage | 60.00% to 74.99% |  |
Schedule of Investments [Line Items] |  |
Loans | 56 | 3
Credit Quality Indicator Current Year [Abstract] |  |
Total | 56 | 3
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 56 | 3
Greater than 1.00 but less than 1.25 | Commercial Mortgage | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Loans | 6 | 0
Credit Quality Indicator Current Year [Abstract] |  |
Total | 6 | 0
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 6 | 0
Greater than 1.00 | Commercial Mortgage |  |
Schedule of Investments [Line Items] |  |
Loans | 19 | 29
Credit Quality Indicator Current Year [Abstract] |  |
Total | 19 | 29
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 19 | 29
Greater than 1.00 | Commercial Mortgage | Less than 50.00% |  |
Schedule of Investments [Line Items] |  |
Loans | 10 | 11
Credit Quality Indicator Current Year [Abstract] |  |
Total | 10 | 11
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 10 | 11
Greater than 1.00 | Commercial Mortgage | 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 | Commercial Mortgage | 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
Greater than 1.00 | Commercial Mortgage | 75.00% to 84.99% |  |
Schedule of Investments [Line Items] |  |
Loans | 9 | 18
Credit Quality Indicator Current Year [Abstract] |  |
Total | 9 | 18
Credit Quality Indicator Prior Year [Abstract] |  |
Total | 9 | 18
Less than 1.00 | Commercial Mortgage |  |
Schedule of Investments [Line Items] |  |
Loans | 19 | 29
Credit Quality Indicator Current Year [Abstract] |  |
2023 | 0 | 9
2022 | 9 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 10 | 20
Total | 19 | 29
Credit Quality Indicator Prior Year [Abstract] |  |
2022 | 0 | 9
2021 | 9 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 10 | 20
Total | $ 19 | $ 29

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