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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 1,362 | $ 1,311
1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 10 | 11
2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 1,316 | 1,262
5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 31 | 32
7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 5 | 6
2024 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 56 |
2024 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2024 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 56 |
2024 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2024 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2023 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 302 | 302
2023 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2023 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 302 | 302
2023 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2023 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 349 | 346
2022 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2022 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 349 | 346
2022 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2022 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 242 | 244
2021 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2021 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 224 | 225
2021 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 13 | 13
2021 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 5 | 6
2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 35 | 35
2020 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 35 | 35
2020 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 378 | 384
Prior | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 10 | 11
Prior | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 350 | 354
Prior | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 18 | 19
Prior | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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