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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 3 OCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Other Comprehensive Income (Loss), before Tax [Abstract]          
Change in cumulative translation adjustment, before tax $ (21) $ 17 $ (28) $ 60  
Amortization of unrecognized prior service credits included in net periodic costs, before tax (10) (11) (30) (33)  
Unrealized gain (loss), before tax 50 49 103 (13)  
Reclassification adjustment for (gain) loss included in net income, before tax (14) 10 (17) 17  
Total other comprehensive income (loss), before tax 5 65 28 31  
Other comprehensive income (loss), net of tax:          
Change in cumulative translation adjustment (21) 17 (28) 60 $ 85
Amortization of unrecognized prior service credits (7) (7) (22) (20)  
Unrealized gain (loss) 37 31 78 (8)  
Reclassification adjustment for (gains) losses included in net income, net (10) 7 (13) 11  
Total other comprehensive income (loss), net of tax $ (1) $ 48 $ 15 $ 43 $ 72