Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Narrative (Details)

v3.21.1
Stockholders' Equity - Narrative (Details)
 1 Months Ended 12 Months Ended
Apr. 20, 2021
$ / shares
Feb. 28, 2021
class_of_stock
$ / shares
Feb. 29, 2020
$ / shares
Feb. 28, 2019
$ / shares
Jan. 31, 2021
USD ($)
Jan. 31, 2018
USD ($)
Class of Stock [Line Items]            
Number of classes of common stock with a material number of shares outstanding | class_of_stock   2        
Class B Convertible Common Stock            
Class of Stock [Line Items]            
Common Stock, terms of conversion   convertible into shares of Class A Common Stock on a one-to-one basis        
Common Stock, voting rights   ten votes per share        
Cash dividends declared per common share   $ 2.72 $ 2.72 $ 2.68    
Class B Convertible Common Stock | Subsequent Event            
Class of Stock [Line Items]            
Cash dividends declared per common share $ 0.69          
Class A Common Stock            
Class of Stock [Line Items]            
Common Stock, voting rights   one vote per share        
Common stock, dividend rights   10.00%        
Cash dividends declared per common share   $ 3.00 $ 3.00 $ 2.96    
Class A Common Stock | Subsequent Event            
Class of Stock [Line Items]            
Cash dividends declared per common share 0.76          
Class 1 Common Stock            
Class of Stock [Line Items]            
Common Stock, terms of conversion   convertible into shares of Class A Common Stock on a one-to-one basis        
Common Stock, voting rights   generally have no voting rights        
Class 1 Common Stock | Subsequent Event            
Class of Stock [Line Items]            
Cash dividends declared per common share $ 0.69          
Class A and Class B | 2018 Authorization            
Class of Stock [Line Items]            
Repurchase authorization | $           $ 3,000,000,000.0
Class A and Class B | 2021 Authorization            
Class of Stock [Line Items]            
Repurchase authorization | $         $ 2,000,000,000.0