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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%