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STOCK-BASED COMPENSATION (Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum term by share based compensation after vesting 10 years    
Weighted-average fair value per share of options granted $ 7.99 $ 15.38 $ 14.44
Share-based Payment Arrangement, Expense $ 23 $ 68 $ 37
Share-based Payment Arrangement, Expense, Tax Benefit 5 15 14
Total amount of cash received from the exercise of options 93 112 310
Total intrinsic value of options exercised 77 160 286
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 17 $ 36 $ 106
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 18    
Employee Service Share-based Compensation, Nonvested, Total Compensation Cost not yet recognized and period for recognition in years 1 year 4 months 13 days    
Employee Stock Option | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Employee Stock Option | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
2019 Stock Incentive Plan [Member] | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 21,265 28,846  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted-Average Exercise Price $ 45.96 $ 46.70  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 1,588    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted-Average Exercise Price $ 54.89    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 3,196    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 30.02    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 239    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 60.77    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Conversion Impact (5,734)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Conversion Impact, Weighted Average Exercise Price $ 59.62    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 7 months 13 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 237    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 18,248    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 43.34    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 11 months 26 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 237