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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended 9 Months Ended
May 22, 2020
May 08, 2020
Mar. 31, 2019
Mar. 29, 2020
Jun. 30, 2019
Mar. 18, 2020
Sep. 29, 2019
Mar. 20, 2019
Oct. 02, 2018
Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]                    
Authorized shares of common stock       2,400,000,000.0     2,400,000,000.0      
Par value of common stock       $ 0.001     $ 0.001      
Authorized shares of preferred stock       7,500,000            
Outstanding shares of preferred stock       0            
Shares available for repurchase       48,900,000            
Dividends payable, payment date May 22, 2020                  
Dividends payable, record date   May 08, 2020                
September ASR [Member]                    
Equity, Class of Treasury Stock [Line Items]                    
Other Commitment                   $ 5,000.0
Up-Front Payment Under Accelerated Share Repurchase Program                 $ 5,000.0  
Accelerated Share Repurchase, Completion Date     March 2019              
Accelerated Share Repurchases, Final Price Paid Per Share         $ 65.03          
Accelerated Share Repurchases, Settlement (Payment) or Receipt, Shares               4,900,000 72,000,000.0  
Open Market [Member]                    
Equity, Class of Treasury Stock [Line Items]                    
Shares of common stock repurchased       20,300,000            
Total cost of common stock repurchased       $ 1,700.0            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           40,000,000