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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Cumulative foreign exchange translation adjustment $ (2,566,000,000) $ (2,709,000,000)  
Pension and other postretirement benefit adjustments (675,000,000) (761,000,000)  
Fair value of designated cash flow hedges 44,000,000 33,000,000  
Accumulated Other Comprehensive Income (Loss) (3,197,000,000) (3,437,000,000) $ (2,235,000,000)
Other Comprehensive Income (Loss), before Tax [Abstract]      
Foreign exchange translation adjustment 143,000,000   (37,000,000)
Pension and other postretirement benefit adjustments 115,000,000   847,000,000
Changes in fair value of designated cash flow hedges 20,000,000   (194,000,000)
Changes in accumulated other comprehensive income, pretax 278,000,000   616,000,000
Other Comprehensive Income (Loss), Tax [Abstract]      
Foreign exchange translation adjustment 0   0
Pensions and other postretirement benefit adjustments (29,000,000)   (170,000,000)
Changes in fair value of designated cash flow hedges (9,000,000)   33,000,000
Other comprehensive income (loss), tax (38,000,000)   (137,000,000)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Foreign exchange translation adjustment 143,000,000 (685,000,000) (37,000,000)
Pensions and other postretirement benefit adjustments 86,000,000 (606,000,000) 677,000,000
Changes in fair value of designated cash flow hedges 11,000,000 85,000,000 (161,000,000)
Components of other comprehensive income (loss), net of tax $ 240,000,000 (1,202,000,000) $ 479,000,000
AOCI Including Spin Transactions [Member]      
Other Comprehensive Income (Loss), before Tax [Abstract]      
Foreign exchange translation adjustment   (728,000,000)  
Pension and other postretirement benefit adjustments   (727,000,000)  
Changes in fair value of designated cash flow hedges   102,000,000  
Changes in accumulated other comprehensive income, pretax   (1,353,000,000)  
Other Comprehensive Income (Loss), Tax [Abstract]      
Foreign exchange translation adjustment   0  
Pensions and other postretirement benefit adjustments   168,000,000  
Changes in fair value of designated cash flow hedges   (17,000,000)  
Other comprehensive income (loss), tax   151,000,000  
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Foreign exchange translation adjustment   (728,000,000)  
Pensions and other postretirement benefit adjustments   (559,000,000)  
Changes in fair value of designated cash flow hedges   85,000,000  
Components of other comprehensive income (loss), net of tax   $ (1,202,000,000)