v3.26.3
Pension Plans and Other Post-Retirement Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Pension expense $ 14 $ 15 $ 44 $ 48
Defined contribution plan, expected contribution amount, remainder of year 15   15  
Defined benefit plan, expected cash contributions, remainder of year 21   21  
Pension Plans [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Plan contributions 31 22 72 64
Other Post-Retirement Benefit Plans [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Plan contributions 3 $ 5 9 $ 12
Defined benefit plan, expected cash contributions, remainder of year $ 3   $ 3