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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2019
Nov. 29, 2018
Jun. 30, 2019
Feb. 28, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 30, 2019
Dec. 31, 2018
Nov. 28, 2018
Dec. 14, 2017
Equity, Class of Treasury Stock [Line Items]                      
Common stock repurchases     $ 0   $ 42 $ 10 $ 93        
Reclassification from capital in excess of par value to treasury stock $ 150                    
Common shares acquired in connection with employee stock plans (in shares)           34 300        
Common shares acquired in connection with employee stock plans, amount           $ 10 $ 69        
Treasury stock reissued (in shares)           130          
Treasury stock reissued           $ 15          
Accumulated other comprehensive income (loss)     112     112     $ (159)    
Net unrealized losses on investment securities                      
Equity, Class of Treasury Stock [Line Items]                      
Accumulated other comprehensive income (loss)     $ 112     $ 112     $ (159)    
December 2017                      
Equity, Class of Treasury Stock [Line Items]                      
Stock repurchase program, authorized amount                     $ 3,000
November 2018 ASR                      
Equity, Class of Treasury Stock [Line Items]                      
Stock repurchase program, authorized amount                   $ 750  
Share repurchase payment   $ 750                  
Shares received 600 1,940   2,540              
Common stock repurchases   $ 600                  
Decrease in capital in excess of par value   $ 150                  
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) $ 295.15                    
Subsequent Event | December 2017                      
Equity, Class of Treasury Stock [Line Items]                      
Stock repurchase program, remaining authorization               $ 1,030      
Subsequent Event | July 2019                      
Equity, Class of Treasury Stock [Line Items]                      
Stock repurchase program, authorized amount               $ 3,000