v3.26.1
Retirement and Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
2 Months Ended
Mar. 31, 2026
Feb. 01, 2026
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Requisite term of service 3 years  
Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Recognized service cost $ 7  
Other net periodic pension benefit (5)  
Expense related to retirement termination benefit 11  
Pension Plan | Nonqualified Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Plan assets in non-qualified plan   $ 0
Pension Plan | Qualified Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Fees paid for accounting and administrative duties to Trustee $ 0  
Pension Plan | Fixed Income Securities | Qualified Plan | Minimum    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Target allocations for plan investments 55.00%  
Pension Plan | Fixed Income Securities | Qualified Plan | Maximum    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Target allocations for plan investments 65.00%  
Pension Plan | Equity securities | Qualified Plan | Minimum    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Target allocations for plan investments 35.00%  
Pension Plan | Equity securities | Qualified Plan | Maximum    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Target allocations for plan investments 45.00%