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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 1,273 | $ 1,044
1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 12 | 15
2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 1,235 | 1,022
5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 26 | 7
7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2023 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 259 |
2023 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2023 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 259 |
2023 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2023 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 |
2022 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 344 | 326
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 | 344 | 326
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 | 245 | 247
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 | 239 | 247
2021 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 6 | 0
2021 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2020 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 35 | 36
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 | 36
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
2019 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 11 | 11
2019 | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 11 | 11
2019 | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
2019 | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 0 | 0
Prior |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 379 | 424
Prior | 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 12 | 15
Prior | 2 to 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 347 | 402
Prior | 5 and 6 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | 20 | 7
Prior | 7 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage loans | $ 0 | $ 0

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