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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Other Comprehensive Income (Loss), before Tax [Abstract]          
Change in cumulative translation adjustment, before tax $ 23 $ (21) $ 40 $ (28)  
Amortization of unrecognized prior service credits included in net periodic costs, before tax (9) (10) (29) (30)  
Unrealized gain (loss), before tax 13 50 (3) 103  
Reclassification adjustment for (gain) loss included in net income, before tax 8 (14) 8 (17)  
Total other comprehensive income (loss), before tax 35 5 16 28  
Other comprehensive income (loss), net of tax:          
Change in cumulative translation adjustment 23 (21) 40 (28) $ (13)
Amortization of unrecognized prior service credits (7) (7) (22) (22)  
Unrealized gain (loss) 10 37 (2) 78  
Reclassification adjustment for (gains) losses included in net income, net 6 (10) 6 (13)  
Total other comprehensive income (loss), net of tax $ 32 $ (1) $ 22 $ 15 $ (36)