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Pension and Other Postretirement Benefits - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
Expected current year company contributions $ 24
Contributions 14
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected current year company contributions 31
Contributions $ 6