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Stock Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares Subject to Option        
Beginning balance (in shares) 33,855,948 43,818,830 48,434,655  
Options granted (in shares) 2,416,800 4,861,990 5,834,836  
Options exercised (in shares) [1] (7,847,964) (13,668,354) (9,333,271)  
Options cancelled (in shares) (672,890) (1,156,518) (1,117,390)  
Ending balance (in shares) 27,751,894 33,855,948 43,818,830  
Exercisable at end of the period (in shares) 21,444,333      
Weighted- Average Exercise or Grant Price Per Share        
Beginning balance (in dollars per share) $ 36.19 $ 32.36 $ 29.92  
Options granted (in dollars per share) 58.50 47.76 43.16  
Options exercised (in dollars per share) [1] 30.55 27.53 25.16  
Options cancelled (in dollars per share) 44.94 42.22 42.93  
Ending balance (in dollars per share) 39.51 $ 36.19 $ 32.36  
Exercisable at end of the period (in dollars per share) $ 36.18      
Average Remaining Contractual Term        
Ending balance 5 years      
Exercisable at end of the period 4 years      
Aggregate Intrinsic Value        
Options exercised $ 205 [1] $ 306 [1] $ 170  
Aggregate intrinsic value 527 640 371 $ 626
Exercisable at end of the period 478      
Cash received from options exercised 236 369 231  
Actual tax benefit realized for the tax deductions from the option exercises $ 27 $ 40 $ 21  
Annual grant to eligible employees        
Shares Subject to Option        
Options granted (in shares) 2,280,440 4,793,570 5,666,530  
Weighted- Average Exercise or Grant Price Per Share        
Options granted (in dollars per share) $ 59.04 $ 47.72 $ 43.51  
Additional options issued        
Shares Subject to Option        
Options granted (in shares) 136,360 68,420 168,306  
Weighted- Average Exercise or Grant Price Per Share        
Options granted (in dollars per share) $ 49.48 $ 50.82 $ 31.40  
[1] Cash received from options exercised was $236 million in 2020, $369 million in 2019 and $231 million in 2018. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $27 million in 2020, $40 million in 2019 and $21 million in 2018.