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STOCK-BASED COMPENSATION (Employees' Stock Purchase Plan) (Details)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, shares, beginning balance | shares 0    
Outstanding, shares, ending balance | shares   0  
Total Compensation Expense $ 359 $ 261 $ 352
Stock-based compensation expense related tax benefit $ 133 $ 97 $ 129
Employees' Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate 10.00%    
Plan price of the stock is set a no less than the following percentage of market price 85.00%    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Exercise Price | $ / shares 0.00 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, shares | shares 3,578    
Granted, exercise price | $ / shares 50.22    
Exercised, shares | shares (3,560)    
Exercised, exercise price | $ / shares 50.22    
Forfeited/Expired, shares | shares (18)    
Forfeited/Expired, exercise price | $ / shares 50.22    
Weighted-average fair value per share of purchase rights granted | $ / shares $ 10.70 $ 3.40 $ 4.62
Total Compensation Expense $ 38 $ 7 $ 15
Stock-based compensation expense related tax benefit 14 3 5
Total amount of cash received from the exercise of purchase rights 179 86 131
Total intrinsic value of purchase rights exercised 48 23 25
Total intrinsic value of purchase rights exercised, related tax benefit $ 18 $ 9 $ 9