v3.26.3
Post-retirement Benefit Plans - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension        
Defined Benefit Plan Disclosure        
Plan assets, contributions by employer     $ 20,000,000  
Other Benefits        
Defined Benefit Plan Disclosure        
Plan assets, contributions by employer       $ 18,000,000
Maximum        
Defined Benefit Plan Disclosure        
Estimated pension plan contributions during next fiscal year $ 7,000,000   7,000,000  
Amortization of net actuarial loss 1,000,000 $ 1,000,000 1,000,000 1,000,000
Other postretirement benefits cost (reversal of cost) 1,000,000 $ 1,000,000 2,000,000 $ 1,000,000
Minimum        
Defined Benefit Plan Disclosure        
Estimated pension plan contributions during next fiscal year $ 3,000,000   $ 3,000,000