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Investments Amortized Costs of Non-accrual Loans (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost of loans on non-accrual | $ 57 | $ 71
Residential Mortgage |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost of loans on non-accrual | 57 | 62
Commercial Mortgage |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost of loans on non-accrual | $ 0 | $ 9

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