ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 01, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jul. 01, 2018	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax	$ 15	$ 17	$ 44	$ 51
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,517)	(1,555)	(1,517)	(1,555)				$ (1,561)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1	2	1	2
Other Comprehensive Income (Loss), Net of Tax	1	1	1	2
Accumulated Other Comprehensive Income (Loss), Net of Tax	(56)	(57)	(56)	(57)		$ (57)		(57)		$ (58)		$ (59)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Other Comprehensive Income (Loss), Net of Tax	14	16	43	49
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	18	21	56	64
Reclassification from AOCI, Current Period, Tax	(4)	(5)	(13)	(15)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,461)	(1,498)	(1,461)	(1,498)		$ (1,475)		$ (1,504)		$ (1,514)		$ (1,293)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ (1)	$ 0	$ 0
Retained Earnings [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 0		$ 0		$ 0		$ (254)