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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 9 Months Ended
Nov. 02, 2018
Mar. 26, 2018
Dec. 22, 2017
Sep. 30, 2018
Mar. 26, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Nov. 06, 2018
Dec. 31, 2017
Dec. 21, 2017
Dec. 14, 2017
Equity, Class of Treasury Stock [Line Items]                        
Dividends declared per common share (in dollars per share)       $ 0.5   $ 0.40 $ 1.5 $ 1.20        
Stock repurchase program, authorized amount                       $ 3,000,000,000
Common stock repurchases       $ 201,000,000   $ 241,000,000 $ 294,000,000 $ 1,819,000,000        
Common shares acquired in connection with employee stock plans (in shares)             260 370        
Common shares acquired in connection with employee stock plans, amount             $ 70,000,000 $ 79,000,000        
Treasury stock reissued (in shares)             870          
Treasury stock reissued             $ 92,000,000          
Accumulated other comprehensive gain (loss)       (206,000,000)     (206,000,000)     $ 19,000,000    
Net unrealized (losses) gains on investment securities                        
Equity, Class of Treasury Stock [Line Items]                        
Accumulated other comprehensive gain (loss)       $ (206,000,000)     $ (206,000,000)     125,000,000    
Additional liability that would exist on closed block of long-term care policies assuming unrealized gains on investments backing such products were realized and reinvested at current yields                        
Equity, Class of Treasury Stock [Line Items]                        
Accumulated other comprehensive gain (loss)                   $ 106,000,000    
Subsequent Event                        
Equity, Class of Treasury Stock [Line Items]                        
Dividends declared per common share (in dollars per share) $ 0.50                      
Remaining authorized amount                 $ 1,800,000,000      
December 2017 ASR                        
Equity, Class of Treasury Stock [Line Items]                        
Stock repurchase program, authorized amount                     $ 1,000,000,000.0  
Share repurchase payment     $ 1,000,000,000                  
Shares   460 3,280   3,740              
Common stock repurchases   $ 200,000,000 $ 800,000,000                  
Decrease in capital in excess of par value     $ 200,000,000                  
Average cost per share (in dollars per share)         $ 267.55