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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 3 OCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Other Comprehensive Income (Loss), before Tax [Abstract]      
Change in cumulative translation adjustment, before tax $ 27 $ 7  
Amortization of unrecognized prior service credits included in net periodic costs, before tax (10) (11)  
Unrealized gain (loss), before tax (31) (34)  
Reclassification adjustment for (gain) loss included in net income, before tax 0 (6)  
Total other comprehensive income (loss), before tax (14) (44)  
Change in cumulative translation adjustment 27 7 $ 85
Amortization of unrecognized prior service credits included in net periodic (credit) cost (7) (7)  
Unrealized gain (loss) (23) (21)  
Reclassification adjustment for (gains) losses included in net income, net 0 (4)  
Total other comprehensive income (loss), net of tax $ (3) $ (25) $ 72