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Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]    
Shares Under Option, Beginning balance 7.9 8.3
Shares Under Option, Granted 1.0 1.2
Shares Under Option, Exercised (1.4) (1.3)
Shares Under Option, Forfeited or canceled (0.2) (0.3)
Shares Under Option, Ending balance 7.3 7.9
Shares Under Option, Exercisable at end of year 1.7 1.8
Shares Under Option, Ending unvested and expected to vest 5.2 5.7
Weighted Average Exercise Price, Beginning balance $ 123.85 $ 107.47
Weighted Average Exercise Price, Granted 243.54 177.78
Weighted Average Exercise Price, Exercised 77.93 62.33
Weighted Average Exercise Price, Forfeited or canceled 160.87 143.78
Weighted Average Exercise Price, Ending balance 148.26 123.85
Weighted Average Exercise Price, Exercisable at end of year 90.06 73.04
Weighted Average Exercise Price, Ending unvested and expected to vest $ 164.49 $ 137.02
Weighted Average Remaining Contractual Term (in years), Ending balance 3 years 9 months 10 days 3 years 11 months 19 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 1 year 9 months 10 days 1 year 7 months 17 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 4 years 4 months 24 days 4 years 7 months 6 days
Aggregate Intrinsic Value, Ending Balance $ 995.3 $ 793.9
Aggregate Intrinsic Value, Exercisable at end of year 336.9 266.4
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 624.4 $ 497.2