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Investments - Mortgage Loans (Details) - Commercial Real Estate - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Mortgage Loans on Real Estate [Line Items] |  |
New mortgage loans | $ 342 | $ 356
Mortgage loans fully repaid | 43 | 178
Mortgage loans foreclosed | $ 0 | $ 0

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