v3.26.1
Pension Plans and Other Post-Retirement Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Pension expense $ 14 $ 15 $ 30 $ 33
Defined contribution plan, expected contribution amount, remainder of year 29   29  
Defined benefit plan, expected cash contributions, remainder of year 51   51  
Pension Plans [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Plan contributions 21 22 41 42
Other Post-Retirement Benefit Plans [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Plan contributions 3 $ 5 6 $ 7
Defined benefit plan, expected cash contributions, remainder of year $ 7   $ 7