PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amounts recognized in Consolidated Balance Sheet [Abstract]
Postretirement benefit obligations other than pensions		$ (512,000,000)	$ (473,000,000)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss [Abstract]
Total recognized in other comprehensive (income) loss		(847,000,000)	336,000,000	$ (129,000,000)
Other Postretirement Benefits for Significant Plans [Member]
Change in Benefit Obligation [Roll forward]
Benefit obligation at beginning of year	$ 530,000,000	492,000,000	569,000,000
Service cost		0	0	0
Interest cost		19,000,000	20,000,000	33,000,000
Plan amendments		91,000,000	27,000,000
Actuarial (gains) losses		(14,000,000)	(31,000,000)
Benefits paid - OPEB		(58,000,000)	(93,000,000)
Benefit obligation at end of year		530,000,000	492,000,000	569,000,000
Change In Plan Assets [Roll forward]
Fair value of plan assets at beginning of year	0	0	0
Actual return on plan assets		0	0
Company contributions		0	0
Benefits paid - OPEB		0	0
Fair value of plan assets at end of year		0	0	0
Funded status of plans		(530,000,000)	(492,000,000)
Amounts recognized in Consolidated Balance Sheet [Abstract]
Accrued Liabilities - Current		(62,000,000)	(62,000,000)
Postretirement benefit obligations other than pensions		(468,000,000)	(430,000,000)
Net amount recognized		(530,000,000)	(492,000,000)
Foreign plans excluded from postretirement benefits other than pensions		44,000,000	43,000,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income [Abstract]
Prior service (credit)		(244,000,000)	(393,000,000)
Net actuarial loss		109,000,000	136,000,000
Net amount recognized		(135,000,000)	(257,000,000)
Defined Benefit Plan Disclosure [Abstract]
Service cost		0	0	0
Interest cost		19,000,000	20,000,000	33,000,000
Amortization of prior service (credit) cost		(58,000,000)	(76,000,000)	(30,000,000)
Recognition of actuarial losses		13,000,000	22,000,000	34,000,000
Net periodic benefit (income) cost		(26,000,000)	(34,000,000)	37,000,000
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss [Abstract]
Actuarial (gains) losses		(14,000,000)	(31,000,000)	(55,000,000)
Prior service cost (credit)		91,000,000	27,000,000	(290,000,000)
Prior service (cost) credit recognized during year		58,000,000	76,000,000	30,000,000
Actuarial losses recognized during year		(13,000,000)	(22,000,000)	(34,000,000)
Total recognized in other comprehensive (income) loss		122,000,000	50,000,000	(349,000,000)
Total recognized in net periodic benefit (income) cost and other comprehensive (income) loss		96,000,000	16,000,000	(312,000,000)
Other Postretirement Benefits for Significant Plans [Member] | Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Abstract]
Amortization of prior service (credit) cost	(52,000,000)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss [Abstract]
Net loss to be amortized	9,000,000
United States [Member]
Change in Benefit Obligation [Roll forward]
Benefit obligation at beginning of year	18,151,000,000	17,414,000,000	17,298,000,000
Service cost		172,000,000	191,000,000	223,000,000
Interest cost		586,000,000	600,000,000	696,000,000
Plan amendments		0	0
Actuarial (gains) losses		1,234,000,000	448,000,000
Benefits paid		(1,146,000,000)	(1,135,000,000)
Settlements and curtailments		(109,000,000)	0
Foreign currency translation		0	0
Other		0	12,000,000
Benefit obligation at end of year		18,151,000,000	17,414,000,000	17,298,000,000
Change In Plan Assets [Roll forward]
Fair value of plan assets at beginning of year	18,985,000,000	16,814,000,000	16,349,000,000
Actual return on plan assets		3,287,000,000	1,554,000,000
Company contributions		139,000,000	36,000,000
Benefits paid		(1,146,000,000)	(1,135,000,000)
Settlements and curtailments		(109,000,000)	0
Foreign currency translation		0	0
Other		0	10,000,000
Fair value of plan assets at end of year		18,985,000,000	16,814,000,000	16,349,000,000
Funded status of plans		834,000,000	(600,000,000)
Amounts recognized in Consolidated Balance Sheet [Abstract]
Other Assets		1,205,000,000	0
Accrued Liabilities - Current		(27,000,000)	(106,000,000)
Other Liabilities - Noncurrent		(344,000,000)	(494,000,000)
Net amount recognized		834,000,000	(600,000,000)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income [Abstract]
Prior service (credit)		(268,000,000)	(312,000,000)
Net actuarial loss		248,000,000	1,099,000,000
Net amount recognized		(20,000,000)	787,000,000
Defined Benefit Plan Disclosure [Abstract]
Service cost		172,000,000	191,000,000	223,000,000
Interest cost		586,000,000	600,000,000	696,000,000
Expected return on plan assets		(1,262,000,000)	(1,226,000,000)	(1,278,000,000)
Amortization of transition obligations		0	0	0
Amortization of prior service (credit) cost		(43,000,000)	(43,000,000)	13,000,000
Recognition of actuarial losses		41,000,000	27,000,000	52,000,000
Settlements and curtailments		18,000,000	0	8,000,000
Net periodic benefit (income) cost		(488,000,000)	(451,000,000)	(286,000,000)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss [Abstract]
Actuarial (gains) losses		(792,000,000)	121,000,000	775,000,000
Prior service cost (credit)		0	0	(429,000,000)
Transition obligation recognized during year		0	0	0
Prior service (cost) credit recognized during year		43,000,000	43,000,000	(13,000,000)
Actuarial losses recognized during year		(59,000,000)	(27,000,000)	(52,000,000)
Foreign currency translation		0	0	0
Total recognized in other comprehensive (income) loss		(808,000,000)	137,000,000	281,000,000
Total recognized in net periodic benefit (income) cost and other comprehensive (income) loss		(1,296,000,000)	(314,000,000)	(5,000,000)
United States [Member] | Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Abstract]
Amortization of prior service (credit) cost	(43,000,000)
Non-U.S. Pension Plans, Defined Benefit [Member]
Change in Benefit Obligation [Roll forward]
Benefit obligation at beginning of year	7,019,000,000	6,483,000,000	6,338,000,000
Service cost		40,000,000	47,000,000	51,000,000
Interest cost		147,000,000	179,000,000	177,000,000
Plan amendments		(1,000,000)	0
Actuarial (gains) losses		(24,000,000)	1,125,000,000
Benefits paid		(253,000,000)	(243,000,000)
Settlements and curtailments		0	(50,000,000)
Foreign currency translation		614,000,000	(930,000,000)
Other		13,000,000	17,000,000
Benefit obligation at end of year		7,019,000,000	6,483,000,000	6,338,000,000
Change In Plan Assets [Roll forward]
Fair value of plan assets at beginning of year	7,151,000,000	6,120,000,000	6,117,000,000
Actual return on plan assets		539,000,000	1,006,000,000
Company contributions		161,000,000	186,000,000
Benefits paid		(253,000,000)	(243,000,000)
Settlements and curtailments		0	0
Foreign currency translation		569,000,000	(957,000,000)
Other		15,000,000	11,000,000
Fair value of plan assets at end of year		7,151,000,000	6,120,000,000	6,117,000,000
Funded status of plans		132,000,000	(363,000,000)
Amounts recognized in Consolidated Balance Sheet [Abstract]
Other Assets		944,000,000	380,000,000
Accrued Liabilities - Current		(12,000,000)	(11,000,000)
Other Liabilities - Noncurrent		(800,000,000)	(732,000,000)
Net amount recognized		132,000,000	(363,000,000)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income [Abstract]
Prior service (credit)		(13,000,000)	(11,000,000)
Net actuarial loss		427,000,000	582,000,000
Net amount recognized		414,000,000	571,000,000
Defined Benefit Plan Disclosure [Abstract]
Service cost		40,000,000	47,000,000	51,000,000
Interest cost		147,000,000	179,000,000	177,000,000
Expected return on plan assets		(411,000,000)	(377,000,000)	(358,000,000)
Amortization of transition obligations		0	0	1,000,000
Amortization of prior service (credit) cost		(1,000,000)	(3,000,000)	(3,000,000)
Recognition of actuarial losses		46,000,000	246,000,000	15,000,000
Settlements and curtailments		0	(7,000,000)	2,000,000
Net periodic benefit (income) cost		(179,000,000)	85,000,000	(115,000,000)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss [Abstract]
Actuarial (gains) losses		(153,000,000)	447,000,000	27,000,000
Prior service cost (credit)		(1,000,000)	0	0
Transition obligation recognized during year		0	0	(1,000,000)
Prior service (cost) credit recognized during year		1,000,000	10,000,000	3,000,000
Actuarial losses recognized during year		(46,000,000)	(246,000,000)	(17,000,000)
Foreign currency translation		43,000,000	(83,000,000)	(37,000,000)
Total recognized in other comprehensive (income) loss		(156,000,000)	128,000,000	(25,000,000)
Total recognized in net periodic benefit (income) cost and other comprehensive (income) loss		$ (335,000,000)	$ 213,000,000	$ (140,000,000)
Non-U.S. Pension Plans, Defined Benefit [Member] | Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Abstract]
Amortization of prior service (credit) cost	$ (1,000,000)