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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Translation Adjustment $ (279)   $ (309) $ (296)
Change in cumulative translation adjustment 30 $ 27 (13)  
Benefit Plans Unrecognized Prior Service Credits 128   106 136
Change in Benefit Plans Unrecognized Prior Service Credits 22   (30)  
Unrealized Gains (Losses) on Derivative Instruments (42)   (41) (48)
Change in Unrealized Gains (Losses) on Derivative Instruments (1)   7  
Unrealized Losses on Investments (1)   (1) (1)
Change in Unrealized Losses on Investments 0   0  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 51      
Accumulated Other Comprehensive Income (Loss), Net of Tax (194)   (245) $ (209)
Total other comprehensive income (loss), net of tax 31 $ (3) $ (36)  
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