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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Oct. 02, 2018
Mar. 31, 2019
Feb. 28, 2019
Dec. 30, 2018
Dec. 31, 2017
Nov. 01, 2018
Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]              
Authorized shares of common stock       2,400,000,000     2,400,000,000
Par value of common stock       $ 0.001     $ 0.001
Authorized shares of preferred stock       7,500,000      
Outstanding shares of preferred stock       0      
Stock Repurchased and Retired During Period, Shares 72,000,000            
Shares of common stock repurchased         28,500,000    
Total cost of common stock repurchased       $ 5,000.0 $ 1,618.2    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           120,000,000  
Shares available for repurchase       96,800,000      
Cash dividend declared to shareholders       $ 0.36      
Dividends payable, payment date       Feb. 22, 2019      
Dividends payable, record date       Feb. 07, 2019      
Repurchase Agreements [Member]              
Equity, Class of Treasury Stock [Line Items]              
Other Commitment             $ 5,000.0
Accelerated Share Repurchases, Settlement (Payment) or Receipt $ 5,000.0            
Minimum [Member] | Scenario, Forecast [Member]              
Equity, Class of Treasury Stock [Line Items]              
Accelerated Share Repurchase, Completion Date     February 2019        
Maximum [Member] | Scenario, Forecast [Member]              
Equity, Class of Treasury Stock [Line Items]              
Accelerated Share Repurchase, Completion Date   March 2019