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SHARE-BASED COMPENSATION - Schedule of Compensation Expense, Cash Proceeds and Intrinsic Value (Details) - USD ($)
$ 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]      
Intrinsic value of stock options exercised and RSUs vested $ 154 $ 83 $ 493
Unrecognized compensation expense related to unvested equity awards $ 515    
Amortization period of unrecognized compensation expense 1 year 1 month 6 days    
Income tax benefit recognized in earnings $ 20 40 138
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense (after-tax) 400 336 241
Cash received from stock options exercised $ 69 $ 24 $ 528