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STOCKHOLDERS' EQUITY Part 3 OCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Other Comprehensive Income (Loss), before Tax [Abstract]          
Change in cumulative translation adjustment, before tax $ 2 $ (20) $ 13 $ (15)  
Amortization of unrecognized prior service credits (10) (9) (29) (28)  
Unrealized gain (loss) during period 76 (17) 115 (12)  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (6) 7 13 21  
Total other comprehensive income (loss), before tax 62 (39) 112 (34)  
Other comprehensive income (loss), net of tax:          
Change in cumulative translation adjustment 2 (20) 13 (15) $ (29)
Amortization of unrecognized prior service credits (7) (7) (21) (21)  
Unrealized gain (loss) during period 57 (13) 86 (9)  
Reclassification adjustment for (gains) losses included in net income, net (4) 6 10 16  
Total other comprehensive income (loss), net of tax $ 48 $ (34) $ 88 $ (29) $ (59)