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Investments - Mortgage Loans (Details) - Commercial Real Estate - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Mortgage Loans on Real Estate [Line Items] |  |
New mortgage loans | $ 33 | $ 59
Mortgage loans fully repaid | 30 | 2
Mortgage loans foreclosed | $ 0 | $ 0

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