Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - 2018 Authorization [Member] - USD ($)
9 Months Ended
Nov. 30, 2018
Nov. 30, 2018
Jan. 31, 2018
Class A and Class B [Member]      
Equity, Class of Treasury Stock [Line Items]      
Repurchase Authorization     $ 3,000,000,000.0
Class A Common Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Dollar Value of Shares Repurchased $ 995,900,000 $ 504,300,000  
Number of Shares Repurchased 4,632,012 2,352,145