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Stock Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Shares Subject to Option      
Balance at January 1, 2018 (In shares)   48,434,655  
Options granted (in shares)   5,828,996  
Options exercised (in shares) [1]   (7,234,369)  
Options canceled (in shares)   (994,002)  
Balance at September 30, 2018 (in shares) 46,035,280 46,035,280 48,434,655
Weighted- Average Exercise or Grant Price Per Share      
Balance at January 1, 2018 (in dollars per share)   $ 29.92  
Options granted (in dollars per share)   43.16  
Options exercised (in dollars per share) [1]   25.62  
Options canceled (in dollars per share)   42.79  
Balance at September 30, 2018 (in dollars per share) $ 31.99 $ 31.99 $ 29.92
Average Remaining Contractual Term      
Average remaining contractual term   5 years 5 years
Aggregate Intrinsic Value      
Aggregate intrinsic value $ 509 $ 509 $ 626
Aggregate intrinsic value options exercised [1]   127  
Cash received from options exercised 67 183  
Actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises $ 6 $ 15  
Annual grant to eligible employees      
Shares Subject to Option      
Options granted (in shares)   5,666,530  
Weighted- Average Exercise or Grant Price Per Share      
Options granted (in dollars per share)   $ 43.51  
Additional options issued      
Shares Subject to Option      
Options granted (in shares)   162,466  
Weighted- Average Exercise or Grant Price Per Share      
Options granted (in dollars per share)   $ 30.99  
[1] Cash received from options exercised was $67 million in the three months and $183 million in the nine months ended September 30, 2018. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $6 million in the three months and $15 million in the nine months ended September 30, 2018.