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STOCK-BASED COMPENSATION - Restricted Stock Units Outstanding, Including Reinvested Dividends (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long Term Incentive Performance Award | Restricted Units      
Shares      
Beginning Balance 1,691    
Vested (867)    
Granted 230    
Reinvested Dividends 64    
Forfeited / Expired (114)    
Ending Balance 1,004 1,691  
Weighted-Average Grant Date Fair Value      
Beginning Balance $ 109.18    
Vested 110.79    
Granted 92.76 $ 107.30 $ 111.42
Forfeited / Expired 107.34    
Ending Balance $ 104.15 $ 109.18  
Weighted-Average  Remaining Contractual Term (in years)      
Non-vested as of December 31, 2020 1 year 2 months 19 days    
Aggregate Intrinsic Value      
Non-vested as of December 31, 2020 $ 169    
Management Incentive Award | Restricted Units [Member]      
Shares      
Beginning Balance 10,739    
Vested (12,195)    
Granted 3,638    
Reinvested Dividends 276    
Forfeited / Expired (165)    
Ending Balance 2,293 10,739  
Weighted-Average Grant Date Fair Value      
Beginning Balance $ 106.94    
Vested 106.60    
Granted 102.54 $ 108.78 $ 110.95
Forfeited / Expired 101.80    
Ending Balance $ 102.91 $ 106.94  
Weighted-Average  Remaining Contractual Term (in years)      
Non-vested as of December 31, 2020 3 months 3 days    
Aggregate Intrinsic Value      
Non-vested as of December 31, 2020 $ 386