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STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Translation Adjustment $ (245)   $ (264) $ (309)
Change in cumulative translation adjustment 19 $ 30 45  
Benefit Plans Unrecognized Prior Service Credits 99   106 106
Change in Benefit Plans Unrecognized Prior Service Credits (7)   0  
Unrealized Gains (Losses) on Derivative Instruments (50)   (55) (41)
Change in Unrealized Gains (Losses) on Derivative Instruments 5   (14)  
Unrealized Losses on Investments (1)   (1) (1)
Change in Unrealized Losses on Investments 0   0  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     31  
Accumulated Other Comprehensive Income (Loss), Net of Tax (197)   (214) $ (245)
Total other comprehensive income (loss), net of tax $ 17 $ 31    
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Effect on Retained Earnings, Tax     (29)  
Accounting Standards Update 2018-02 [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Effect on Retained Earnings, Tax     $ 9