Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 1)

v3.19.1
Stockholders' Equity (Details 1) - USD ($)
 12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Jan. 31, 2018
Nov. 30, 2016
Apr. 30, 2012
Equity, Class of Treasury Stock [Line Items]            
Dollar Value of Shares Repurchased $ 504,300,000 $ 1,038,500,000 $ 1,122,700,000      
Class A and Class B [Member] | 2013 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Repurchase Authorization           $ 1,000,000,000
Class A and Class B [Member] | 2017 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Repurchase Authorization         $ 1,000,000,000  
Class A and Class B [Member] | 2018 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Repurchase Authorization       $ 3,000,000,000    
Class A Common Stock [Member]            
Equity, Class of Treasury Stock [Line Items]            
Dollar Value of Shares Repurchased $ 504,300,000 $ 1,038,500,000 $ 1,122,700,000      
Number of Shares Repurchased 2,352,145 4,810,061 7,407,051      
Class A Common Stock [Member] | 2013 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Dollar Value of Shares Repurchased $ 0 $ 0 $ 669,600,000      
Number of Shares Repurchased 0 0 4,400,504      
Class A Common Stock [Member] | 2017 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Dollar Value of Shares Repurchased $ 0 $ 546,900,000 $ 453,100,000      
Number of Shares Repurchased 0 2,530,194 3,006,547      
Class A Common Stock [Member] | 2018 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Dollar Value of Shares Repurchased $ 504,300,000 $ 491,600,000 $ 0      
Number of Shares Repurchased 2,352,145 2,279,867 0      
Remaining authorized repurchase amount $ 2,004,100,000