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STOCK-BASED COMPENSATION PLANS - RSUS (Details) - Stock Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options [Member]      
Restricted Stock Units [Line Items]      
Nonvested options recognized over weighted average period, years 2 years 4 months    
Unrecognized compensation on nonvested stock options $ 140    
Vesting periods 4 years    
Income Statement Impact From RSUs [Abstract]      
Share-based compensation expense $ 78 $ 85 $ 70
Future income tax benefit recognized $ 26 $ 31 $ 24
Restricted Stock Units (RSUs) [Member]      
Restricted Stock Units [Line Items]      
Nonvested options recognized over weighted average period, years 3 years 5 months    
Unrecognized compensation on nonvested stock options $ 185    
Restricted Stock Units Number of Options [Abstract]      
Non-vested at beginning of period, 5,899,194 6,692,220 8,095,739
Granted 1,190,406 1,455,209 1,904,504
Vested (1,681,342) (1,787,894) (2,995,553)
Forfeited (426,670) (460,341) (312,470)
Non-vested at end of period, 4,981,588 5,899,194 6,692,220
Weighted average grant date fair value per share [Abstract]      
Non-vested at beginning of period, $ 70.32 $ 60.04 $ 49.91
Granted 103.04 94.88 75.73
Vested 56.38 53.63 42.17
Forfeited 77.73 63.54 56.58
Non-vested at end of period, $ 82.18 $ 70.32 $ 60.04
Income Statement Impact From RSUs [Abstract]      
Share-based compensation expense $ 97 $ 102 $ 100
Future income tax benefit recognized $ 29 $ 37 $ 35