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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended
Feb. 28, 2019
Nov. 29, 2018
Mar. 31, 2019
Feb. 28, 2019
Mar. 31, 2018
May 01, 2019
Dec. 31, 2018
Nov. 28, 2018
Dec. 14, 2017
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase program, authorized amount                 $ 3,000,000,000
Common stock repurchases     $ 10,000,000   $ 51,000,000        
Reclassification from capital in excess of par value to treasury stock $ 150,000,000                
Common shares acquired in connection with employee stock plans (in shares)     30   190        
Common shares acquired in connection with employee stock plans, amount     $ 10,000,000   $ 51,000,000        
Treasury stock reissued (in shares)     100            
Treasury stock reissued     $ 12,000,000            
Accumulated other comprehensive loss     (10,000,000)       $ (159,000,000)    
Subsequent Event                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase program, remaining authorization           $ 1,000,000,000      
Net unrealized losses on investment securities                  
Equity, Class of Treasury Stock [Line Items]                  
Accumulated other comprehensive loss     $ (10,000,000)       $ (159,000,000)    
November 2018 ASR                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase program, authorized amount               $ 750,000,000  
Share repurchase payment   $ 750,000,000              
Shares received 600 1,940   2,540          
Common stock repurchases   $ 600,000,000              
Decrease in capital in excess of par value   $ 150,000,000              
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) $ 295.15