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STOCKHOLDERS' EQUITY Part 3 OCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Other Comprehensive Income (Loss), before Tax [Abstract]          
Change in cumulative translation adjustment, before tax $ (14) $ (13) $ 5 $ 17  
Amortization of unrecognized prior service credits included in net periodic costs, before tax (9) (10) (19) (20)  
Unrealized gain (loss), before tax (5) (29) 5 (16)  
Reclassification adjustment for (gain) loss included in net income, before tax 17 2 14 0  
Total other comprehensive income (loss), before tax (11) (50) 5 (19)  
Other comprehensive income (loss), net of tax:          
Change in cumulative translation adjustment (14) (13) 5 17 $ 45
Amortization of unrecognized prior service credits (7) (8) (14) (15)  
Unrealized gain (loss) (3) (22) 4 (12)  
Reclassification adjustment for (gains) losses included in net income, net 12 2 10 0  
Total other comprehensive income (loss), net of tax $ (12) $ (41) $ 5 $ (10)