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Stockholders Equity (Narrative) (Details)
1 Months Ended 3 Months Ended
Aug. 21, 2020
$ / shares
Nov. 03, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Aug. 31, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
$ / shares
Jun. 30, 2020
$ / shares
Nov. 06, 2019
USD ($)
$ / shares
Stockholders Equity [Line Items]                
Stock repurchase program, value of shares repurchased during the period | $         $ 270,000,000      
Class A Common Stock                
Stockholders Equity [Line Items]                
Common stock, par value     $ 0.01   $ 0.01   $ 0.01 $ 0.01
Accelerated share repurchases agreement, amount | $       $ 154,000,000        
Accelerated share repurchases, amount of payment to third party financial institution | $       $ 154,000,000        
Stock repurchase program, number of shares repurchased during the period | shares     900,000 4,700,000        
Accelerated share repurchases, percentage of shares expected to be repurchased       80.00%        
Accelerated share repurchases, initial price paid per share $ 26.00              
Accelerated share repurchases, final price paid per share     $ 27.57          
Cash dividend per share         0.23 $ 0.23    
Class A Common Stock | Semi Annual Dividend                
Stockholders Equity [Line Items]                
Cash dividend per share         $ 0.23      
Dividend payable period, month and year     2020-10   2020-10      
Dividend record date         Sep. 02, 2020      
Class B Common Stock                
Stockholders Equity [Line Items]                
Common stock, par value     $ 0.01   $ 0.01   $ 0.01 $ 0.01
Accelerated share repurchases agreement, amount | $       $ 66,000,000        
Accelerated share repurchases, amount of payment to third party financial institution | $       $ 66,000,000        
Stock repurchase program, number of shares repurchased during the period | shares     400,000 2,000,000        
Accelerated share repurchases, percentage of shares expected to be repurchased       80.00%        
Accelerated share repurchases, initial price paid per share $ 26.01              
Accelerated share repurchases, final price paid per share     $ 27.67          
Cash dividend per share         0.23 $ 0.23    
Class B Common Stock | Semi Annual Dividend                
Stockholders Equity [Line Items]                
Cash dividend per share         $ 0.23      
Dividend payable period, month and year     2020-10   2020-10      
Dividend record date         Sep. 02, 2020      
Class A and Class B Common Stock                
Stockholders Equity [Line Items]                
Stock repurchase program, authorized amount | $               $ 2,000,000,000
Number of accelerated share repurchase | shares       2        
Stock repurchase program, number of shares repurchased during the period | shares         10,000,000      
Stock repurchase program, value of shares repurchased during the period | $         $ 270,000,000      
Stock repurchase program, remaining buyback authorization amount | $     $ 1,100,000,000   $ 1,100,000,000      
Class A and Class B Common Stock | Subsequent Event                
Stockholders Equity [Line Items]                
Stock repurchase program, number of shares repurchased during the period | shares   1,300,000            
Stock repurchase program, value of shares repurchased during the period | $   $ 35,000,000