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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 1,311 | $ 1,044
2023 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 302 |
2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 346 | 326
2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 244 | 247
2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 35 | 36
2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 11 | 11
Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 373 | 424
1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 11 | 15
1 | 2023 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
1 | 2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
1 | 2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
1 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
1 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
1 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 11 | 15
2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 1,262 | 1,022
2 to 4 | 2023 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 302 |
2 to 4 | 2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 346 | 326
2 to 4 | 2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 225 | 247
2 to 4 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 35 | 36
2 to 4 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 11 | 11
2 to 4 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 343 | 402
5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 32 | 7
5 and 6 | 2023 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
5 and 6 | 2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
5 and 6 | 2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 13 | 0
5 and 6 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
5 and 6 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
5 and 6 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 19 | 7
7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 6 | 0
7 | 2023 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
7 | 2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | 2021 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 6 | 0
7 | 2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | 2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
7 | Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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