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Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax $ 1 $ 0 $ 1 $ 1
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (2) (2) (3) (5)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Liability Adjustment        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Total $ (1) $ (2) $ (2) $ (4)