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Benefit Plans - Cash flows (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Pension benefits      
Components of net periodic cost      
Discretionary contribution to qualified pension plan $ 35,000,000    
Defined benefit pension plans, estimated employer contributions in next fiscal year   $ 14,000,000  
Employer contribution   44,000,000 $ 45,000,000
Postretirement benefits      
Components of net periodic cost      
Defined benefit pension plans, estimated employer contributions in next fiscal year   0  
Employer contribution   21,000,000 24,000,000
Participant contributions   $ 11,000,000 $ 13,000,000