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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jul. 01, 2018
Jun. 18, 2019
Mar. 23, 2019
Mar. 20, 2019
Nov. 01, 2018
Oct. 02, 2018
Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]                        
Authorized shares of common stock 2,400,000,000   2,400,000,000   2,400,000,000             2,400,000,000
Par value of common stock $ 0.001   $ 0.001   $ 0.001             $ 0.001
Authorized shares of preferred stock 7,500,000   7,500,000   7,500,000              
Outstanding shares of preferred stock 0   0   0              
Shares of common stock repurchased         116,100,000 73,000,000.0            
Total cost of common stock repurchased         $ 8,000.0 $ 4,100.0            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                   120,000,000    
Shares available for repurchase 52,700,000   52,700,000   52,700,000              
Cash dividend declared to shareholders $ 0.36   $ 0.36   $ 0.36              
Dividends payable, payment date     Aug. 23, 2019                  
Dividends payable, record date     Aug. 08, 2019                  
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  
MarchASR [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Other Commitment   $ 2,000.0   $ 2,000.0                
Up-Front Payment Under Accelerated Share Repurchase Program   $ 2,000.0   $ 2,000.0                
Accelerated Share Repurchase, Completion Date June 2019                      
Accelerated Share Repurchases, Final Price Paid Per Share         $ 76.50              
Accelerated Share Repurchases, Settlement (Payment) or Receipt, Shares             3,900,000 22,200,000        
Open Market [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Shares of common stock repurchased         13,100,000              
Total cost of common stock repurchased         $ 954.3