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STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Jul. 01, 2015
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Aug. 31, 2013
Mar. 31, 2013
May. 04, 2006
May. 03, 2006
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]                                
Preferred stock, par value       $ 1.00                        
Preferred stock, shares outstanding       0                        
Common stock, par value       $ 0.01 $ 0.01                   $ 0.01  
Common stock, shares authorized       600,000,000 600,000,000                   600,000,000 300,000,000
Dividend program   $ 0.30 $ 0.30 $ 0.38 $ 0.33 $ 0.30 $ 0.38 $ 0.38 $ 0.38 $ 0.33 $ 0.33 $ 0.33   $ 0.30    
Treasury stock value acquired cost method       $ 224 $ 132 $ 1,037                    
Stock repurchase program, remaining authorized repurchase amount       $ 972                        
Reissuance of shares for employee benefit plan       1,000,000 2,000,000 3,000,000                    
Sale of noncontrolling interest in subsidiary       $ 63 $ 0 $ 0                    
Redeemable noncontrolling interest         0                      
UMass Joint Venture [Member]                                
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]                                
Consideration $ 68                              
Sale of noncontrolling interest in subsidiary $ 50                              
Redeemable noncontrolling interest       $ 70                        
Ownership percentage by noncontrolling owners 18.90%                              
Maximum [Member]                                
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]                                
Preferred stock, shares authorized       10,000,000                        
Accelerated Share Repurchase Program [Member]                                
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]                                
Treasury stock value acquired cost method   $ 350 $ 450                          
Purchases of treasury stock, shares   5,800,000 7,600,000                          
Treasury stock acquired accelerated share repurchase, final purchase price, per share   $ 60.73 $ 59.46                          
Share Repurchases Open Market [Member]                                
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]                                
Additional authorized amount       $ 500                 $ 1,000      
Treasury stock value acquired cost method       $ 224 $ 132 $ 237                    
Purchases of treasury stock, shares       3,200,000 2,200,000 4,100,000