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Income Taxes - Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits, Excluding Interest and Penalties (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 86 $ 83 $ 43
(Decreases) increases for tax positions taken during prior years (4) (5) 35
Increases for tax positions taken during the current year 36 12 9
Reductions related to expiration of statutes of limitations and audit settlements (24) (4) (4)
Balance at end of year $ 94 $ 86 $ 83