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Pension Plans and Other Postretirement Benefits - Defined Benefit Plan Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2024
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 159
2026 152
2027 154
2028 156
2029 157
2030 through 2034 778
Other Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2025 4
2026 4
2027 4
2028 4
2029 4
2030 through 2034 $ 18