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Stock Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares Subject to Option        
Beginning balance (in shares) 27,751,894 33,855,948 43,818,830  
Options granted (in shares) 2,573,350 2,416,800 4,861,990  
Options exercised (in shares) [1] (6,249,330) (7,847,964) (13,668,354)  
Options cancelled (in shares) (572,155) (672,890) (1,156,518)  
Ending balance (in shares) 23,503,759 27,751,894 33,855,948  
Exercisable at end of the period (in shares) 18,570,547      
Weighted- Average Exercise or Grant Price Per Share        
Beginning balance (in dollars per share) $ 39.51 $ 36.19 $ 32.36  
Options granted (in dollars per share) 56.26 58.50 47.76  
Options exercised (in dollars per share) [1] 33.68 30.55 27.53  
Options cancelled (in dollars per share) 49.65 44.94 42.22  
Ending balance (in dollars per share) 42.65 $ 39.51 $ 36.19  
Exercisable at end of the period (in dollars per share) $ 39.40      
Average Remaining Contractual Term        
Ending balance 5 years      
Exercisable at end of the period 4 years      
Aggregate Intrinsic Value        
Options exercised $ 169 [1] $ 205 [1] $ 306  
Aggregate intrinsic value 556 527 640 $ 371
Exercisable at end of the period 500      
Cash received from options exercised 206 236 369  
Actual tax benefit realized for the tax deductions from the option exercises $ 24 $ 27 $ 40  
Annual grant to eligible employees        
Shares Subject to Option        
Options granted (in shares) 2,412,710 2,280,440 4,793,570  
Weighted- Average Exercise or Grant Price Per Share        
Options granted (in dollars per share) $ 56.13 $ 59.04 $ 47.72  
Additional options issued        
Shares Subject to Option        
Options granted (in shares) 160,640 136,360 68,420  
Weighted- Average Exercise or Grant Price Per Share        
Options granted (in dollars per share) $ 58.17 $ 49.48 $ 50.82  
[1] Cash received from options exercised was $206 million in 2021, $236 million in 2020 and $369 million in 2019. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $24 million in 2021, $27 million in 2020 and $40 million in 2019.