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Stock Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2017
Dec. 31, 2018
Shares Subject to Option        
Balance at January 1, 2019 (in shares)   43,818,830    
Options granted (in shares)   4,853,600    
Options exercised (in shares) [1]   (10,842,077)    
Options canceled (in shares)   (697,437)    
Balance at June 30, 2019 (in shares) 37,132,916 37,132,916    
Weighted- Average Exercise or Grant Price Per Share        
Balance at January 1, 2019 (in dollars per share)   $ 32.36    
Options granted (in dollars per share)   47.76    
Options exercised (in dollars per share) [1]   27.03    
Options canceled (in dollars per share)   40.51    
Balance at June 30, 2019 (in dollars per share) $ 35.78 $ 35.78    
Average Remaining Contractual Term        
Average remaining contractual term   6 years 5 years  
Aggregate Intrinsic Value        
Aggregate intrinsic value $ 673 $ 673   $ 371
Aggregate intrinsic value options exercised [1]   235    
Cash received from options exercised 118 293    
Actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises $ 13 $ 29    
Annual grant to eligible employees        
Shares Subject to Option        
Options granted (in shares)   4,793,570    
Weighted- Average Exercise or Grant Price Per Share        
Options granted (in dollars per share)   $ 47.72    
Additional options issued        
Shares Subject to Option        
Options granted (in shares)   60,030    
Weighted- Average Exercise or Grant Price Per Share        
Options granted (in dollars per share)   $ 51.25    
[1]
Cash received from options exercised was $118 million in the three months and $293 million in the six months ended June 30, 2019. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $13 million in the three months and $29 million in the six months ended June 30, 2019.