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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 21, 2020
Feb. 06, 2020
Mar. 31, 2019
Dec. 29, 2019
Mar. 31, 2019
Sep. 29, 2019
Mar. 20, 2019
Dec. 30, 2018
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       16,200,000            
Cash dividend declared to shareholders       $ 0.41       $ 0.36    
Dividends payable, payment date Feb. 21, 2020                  
Dividends payable, record date   Feb. 06, 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       13,000,000.0            
Total cost of common stock repurchased       $ 1,100.0