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Investments - Amortized Cost of Mortgage Loans on Real Estate on Nonaccrual Status (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual with no Allowance for Credit Losses | $ 60 | $ 0
Nonaccrual | 61 | 62
Commercial mortgage loans on real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual with no Allowance for Credit Losses | 60 | 0
Nonaccrual | 0 | 0
Residential mortgage loans on real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual with no Allowance for Credit Losses | 0 | 0
Nonaccrual | $ 61 | $ 62

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