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Net Income Per Share (Narrative) (Details) - Convertible Senior Notes [Member] - 2028 Convertible Senior Notes [Member] - USD ($)
$ in Millions
Aug. 31, 2018
Aug. 24, 2018
Debt Instrument [Line Items]    
Convertible senior notes, issued $ 880 $ 880
Convertible senior notes, interest rate 2.00% 2.00%