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Investments - Commercial Mortgage Loans Segregated By Aging of Loans and Charge Offs (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Charge-offs |  |
2023 | $ 0 | $ 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Commercial mortgage loans |  |
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
Loans under development, amortized cost | 22 | 22
Loans under development, fair value | 22 | 22
Charge-offs |  |
Prior | 0 | 3
Total | 0 | 3
Commercial mortgage loans | Current (less than 30 days past due) |  |
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
Commercial mortgage loans | 30-89 days past due |  |
Credit Quality Indicator Current Year [Abstract] |  |
2024 | 0 | 0
2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
Prior | 0 | 0
Total | 0 | 0
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 0 | 0
Total | 0 | 0
Commercial mortgage loans | 90 Days or more past due |  |
Credit Quality Indicator Current Year [Abstract] |  |
2024 | 0 | 0
2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
Prior | 0 | 0
Total | 0 | 0
Credit Quality Indicator Prior Year [Abstract] |  |
2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 0 | 0
Total | $ 0 | $ 0

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