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Employee Benefit Arrangements - Plan Assets, Allocation (Details) - Pension Plan | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 100.00% | 100.00%
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 8.90% | 8.20%
Equity securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range, minimum | 5.00% | 5.00%
Equity securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range, minimum | 13.00% | 13.00%
Large-cap domestic |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 4.40% | 4.30%
Small/Mid-cap domestic |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 1.00% | 0.90%
International Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 3.50% | 2.90%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 0.00% | 0.10%
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 85.00% | 85.80%
Debt securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range, minimum | 83.00% | 83.00%
Debt securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range, minimum | 87.00% | 87.00%
U.S. Treasuries, short term investments, cash and futures |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 2.50% | 2.00%
U.S. Government agencies and authorities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 7.00% | 4.70%
U.S. corporate, state and municipalities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 62.40% | 66.80%
Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 6.10% | 6.00%
Other investments | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range, minimum | 2.00% | 2.00%
Other investments | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation range, minimum | 10.00% | 10.00%
Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 3.30% | 2.90%
Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 2.80% | 3.10%
Foreign securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 13.10% | 12.30%

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