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Investments (Mortgage Loans in Nonaccrual Status by Portfolio Segment) (Details) - Mortgage Loans - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Financing Receivable, Nonaccrual [Line Items] |  |
Financing receivable in nonaccrual status | $ 132 | $ 107
Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Financing receivable in nonaccrual status | 31 | 17
Agricultural |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Financing receivable in nonaccrual status | 0 | 0
Residential |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Financing receivable in nonaccrual status | $ 101 | $ 90

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