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Shares Used in Computing Net Income Per Share - Schedule of Weighted-Average Number of Shares (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Weighted-average common shares outstanding used for the calculation of net income per share – basic 391.7 413.1
Common stock equivalents (in shares) 7.4 8.5
Weighted-average common shares outstanding used for the calculation of net income per share – diluted 399.1 421.6