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STOCKHOLDERS’ EQUITY - Stock-based Compensation Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stockholders Equity Note [Line Items]              
Shares available for future awards under the stock-based compensation plans (in shares)         24    
Stock compensation $ 22 $ 20 $ 57 $ 54 $ 122 $ 115 $ 107
Tax benefit related to stock based compensation         70 61 87
Excess tax benefit for stock based compensation         $ 54 $ 40 $ 56
Marketing and Administrative Expenses              
Stockholders Equity Note [Line Items]              
Stock compensation expense allocation percentage         80.00% 80.00%