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Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Shares Under Option    
Shares Under Option, Beginning balance (in shares) 6.7  
Stock options granted (in shares) 1.5 0.8
Shares Under Option, Exercised (in shares) (0.5)  
Shares Under Option, Forfeited or canceled (in shares) (0.1)  
Shares Under Option, Ending balance (in shares) 7.6  
Shares Under Option, Exercisable at end of period (in shares) 3.1  
Shares Under Option, Ending unvested and expected to vest (in shares) 4.1  
Weighted Average Exercise Price    
Weighted Average Exercise Price, Beginning balance (in dollars per share) $ 177.48  
Weighted Average Exercise Price, Granted (in dollars per share) 228.20  
Weighted Average Exercise Price, Exercised (in dollars per share) 95.43  
Weighted Average Exercise Price, Forfeited or canceled (in dollars per share) 187.95  
Weighted Average Exercise Price, Ending balance (in dollars per share) 192.31  
Weighted Average Exercise Price, Exercisable at end of period (in dollars per share) 132.32  
Weighted Average Exercise Price, Ending unvested and expected to vest (in dollars per share) $ 231.76  
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 25 days  
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 2 months 19 days  
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 5 years 3 months  
Aggregate Intrinsic Value, Ending Balance $ 323  
Aggregate Intrinsic Value, Exercisable at end of year 259  
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 61