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COMMON STOCK - Accelerated Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended
Nov. 30, 2018
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Nov. 30, 2017
Oct. 31, 2016
Apr. 30, 2016
Feb. 29, 2016
February 2016                  
Accelerated Share Repurchase                  
Amount Paid                 $ 325,000,000
Shares repurchased (in shares)                 3.2
Initial delivery, price per share (in dollars per share)                 $ 83.60
Value of shares as a percent of total contract value                 82.00%
April 2016 (tranche 1)                  
Accelerated Share Repurchase                  
Shares repurchased (in shares)               1.8  
Final settlement per share price (in dollars per share)               $ 84.39  
October 2016 (tranche 2)                  
Accelerated Share Repurchase                  
Shares repurchased (in shares)             1.7    
Final settlement per share price (in dollars per share)             $ 101.82    
November 2017                  
Accelerated Share Repurchase                  
Amount Paid           $ 150,000,000      
Shares repurchased (in shares)         1.3 1.1      
Initial delivery, price per share (in dollars per share)           $ 109.86      
Value of shares as a percent of total contract value           80.00%      
Final settlement per share price (in dollars per share)         $ 114.85        
April 2018                  
Accelerated Share Repurchase                  
Amount Paid       $ 400,000,000          
Shares repurchased (in shares)     2.8 2.5          
Initial delivery, price per share (in dollars per share)       $ 127.36          
Value of shares as a percent of total contract value       80.00%          
Final settlement per share price (in dollars per share)     $ 142.37            
October 2018                  
Accelerated Share Repurchase                  
Amount Paid   $ 250,000,000              
Shares repurchased (in shares) 1.7 1.4              
Initial delivery, price per share (in dollars per share)   $ 139.22              
Value of shares as a percent of total contract value   80.00%              
Final settlement per share price (in dollars per share) $ 150.54