Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

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Stockholders' Equity (Details Textual) - USD ($)
9 Months Ended
Nov. 30, 2018
Nov. 30, 2018
Jan. 31, 2018
Equity, Class of Treasury Stock [Line Items]      
Number of treasury shares retired   74,000,000  
Class A and Class B [Member] | 2018 Authorization [Member]      
Equity, Class of Treasury Stock [Line Items]      
Repurchase authorization     $ 3,000,000,000.0
Class A Common Stock [Member] | 2018 Authorization [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share repurchases 4,632,012 2,352,145  
Dollar value of shares repurchased $ 995,900,000 $ 504,300,000