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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2019
Apr. 01, 2018
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       109,300,000 55,900,000          
Total cost of common stock repurchased       $ 7,700.0 $ 3,200.0          
Stock Repurchase Program, Number of Shares Authorized to be Repurchased               120,000,000    
Shares available for repurchase   59,500,000 59,500,000 59,500,000            
Cash dividend declared to shareholders   $ 0.36 $ 0.36 $ 0.36            
Dividends payable, payment date     May 24, 2019              
Dividends payable, record date     May 09, 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 $ 2,000.0            
Up-Front Payment Under Accelerated Share Repurchase Program   $ 2,000.0 $ 2,000.0 $ 2,000.0            
Accelerated Share Repurchases, Settlement (Payment) or Receipt, Shares           22,200,000        
Accelerated Share Repurchase Program, Initial Delivery Terms     which approximated 80 percent of the total value              
Accelerated Share Repurchases, Initial Price Paid Per Share   $ 71.96                
Open Market [Member]                    
Equity, Class of Treasury Stock [Line Items]                    
Shares of common stock repurchased       10,200,000            
Total cost of common stock repurchased       $ 713.2            
Maximum [Member] | Scenario, Forecast [Member] | MarchASR [Member]                    
Equity, Class of Treasury Stock [Line Items]                    
Accelerated Share Repurchase, Completion Date June 2019