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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 1,487 | $ 1,311
1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 8 | 11
2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 1,419 | 1,262
5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 60 | 32
7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 6
2024 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 255 |
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 | 255 |
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 | 301 | 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 | 301 | 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 | 339 | 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 | 334 | 346
2022 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 5 | 0
2022 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 219 | 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 | 206 | 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 | 0 | 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 | 338 | 384
Prior | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 8 | 11
Prior | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 288 | 354
Prior | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 42 | 19
Prior | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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