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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 3 OCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Other Comprehensive Income (Loss), before Tax [Abstract]      
Change in cumulative translation adjustment, before tax $ 30 $ 27  
Amortization of unrecognized prior service credits included in net periodic costs, before tax (10) (10)  
Unrealized gain (loss), before tax 13 (31)  
Reclassification adjustment for (gain) loss included in net income, before tax (3) 0  
Total other comprehensive income (loss), before tax 30 (14)  
Other comprehensive income (loss), net of tax:      
Change in cumulative translation adjustment 30 27 $ (13)
Amortization of unrecognized prior service credits (7) (7)  
Unrealized gain (loss) 10 (23)  
Reclassification adjustment for (gains) losses included in net income, net (2) 0  
Total other comprehensive income (loss), net of tax $ 31 $ (3) $ (36)