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Retirement Benefits Plan - Summary of defined contribution plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Defined Contribution Plans Explanatory [Abstract]    
Defined contribution plans $ 4 $ 5
401(k) matched savings plan 6 5
Total pension expense $ 10 $ 10