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STOCK-BASED COMPENSATION (Employee Stock Purchase Plan) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense $ 158 $ 188 $ 310
Share-based Payment Arrangement, Expense, Tax Benefit $ 36 $ 42 $ 115
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     $ 10.70
Share-based Payment Arrangement, Expense     $ 38
Share-based Payment Arrangement, Expense, Tax Benefit     14
Total amount of cash received from the exercise of purchase rights     179
Total intrinsic value of purchase rights exercised     48
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Employee Stock Puchase Plan Purchase Rights Exercised     $ 18