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Stock Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 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) 4,800,990    
Options exercised (in shares) [1] (6,536,928)    
Options canceled (in shares) (352,913)    
Balance at March 31, 2019 (in shares) 41,729,979    
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) 47.72    
Options exercised (in dollars per share) [1] 25.90    
Options canceled (in dollars per share) 39.13    
Balance at March 31, 2019 (in dollars per share) $ 35.08    
Average Remaining Contractual Term      
Average remaining contractual term 6 years 5 years  
Aggregate Intrinsic Value      
Aggregate intrinsic value $ 619   $ 371
Aggregate intrinsic value options exercised [1] 134    
Cash received from options exercised 175    
Actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises $ 16    
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) 7,420    
Weighted- Average Exercise or Grant Price Per Share      
Options granted (in dollars per share) $ 47.26    
[1] Cash received from options exercised was $175 million in the three months ended March 31, 2019. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $16 million in the three months ended March 31, 2019.