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Stock Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Shares Subject to Option    
Balance at January 1, 2021 (in shares) 27,751,894  
Options granted (in shares) 2,460,250  
Options exercised (in shares) [1] (1,734,108)  
Options canceled (in shares) (222,648)  
Balance at March 31, 2021 (in shares) 28,255,388 27,751,894
Weighted- Average Exercise or Grant Price Per Share    
Balance at January 1, 2021 (in dollars per share) $ 39.51  
Options granted (in dollars per share) 56.15  
Options exercised (in dollars per share) [1] 29.72  
Options canceled (in dollars per share) 44.57  
Balance at March 31, 2021 (in dollars per share) $ 41.52 $ 39.51
Average Remaining Contractual Term    
Average remaining contractual term 6 years 5 years
Aggregate Intrinsic Value    
Aggregate intrinsic value $ 482 $ 527
Aggregate intrinsic value options exercised [1] 46  
Cash received from options exercised 67  
Actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises $ 7  
Annual grant to eligible employees    
Shares Subject to Option    
Options granted (in shares) 2,412,080  
Weighted- Average Exercise or Grant Price Per Share    
Options granted (in dollars per share) $ 56.13  
Additional options issued    
Shares Subject to Option    
Options granted (in shares) 48,170  
Weighted- Average Exercise or Grant Price Per Share    
Options granted (in dollars per share) $ 57.09  
[1] Cash received from options exercised was $67 million in the three months ended March 31, 2021. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $7 million in the three months ended March 31, 2021.