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STOCK-BASED COMPENSATION (Employee Stock Purchase Plan) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 188 $ 310 $ 225
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 42 $ 115 $ 83
Employees' Stock Purchase Plan      
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%    
Share based compensation arrangement by share based payment award discount from market price offering date company specific 85.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00 $ 10.70 $ 3.40
Allocated Share-based Compensation Expense $ 0 $ 38 $ 7
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 0 14 3
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options 0 179 86
Share based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value Monetary 0 48 23
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Employee Stock Puchase Plan Purchase Rights Exercised $ 0 $ 18 $ 9