Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - 2018 Authorization [Member] - USD ($)
3 Months Ended
May 31, 2018
May 31, 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 $ 591,600,000 $ 100,000,000  
Number of Shares Repurchased 2,730,375 450,508