OTHER COMPREHENSIVE INCOME Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (expense)/benefit		$ (67)	$ (128)	$ (161)	$ (234)
Total reclassifications for the period		(48)	(40)	(105)	443
Prior-service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax	[1]	(5)	(3)	(10)	(6)
Actuarial gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax	[1]	(47)	(50)	(103)	(102)
Accumulated defined benefit plans adjustment including portion attributable to noncontrolling interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax		(52)	(53)	(113)	(108)
Tax (expense)/benefit		13	13	28	27
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		(39)	(40)	(85)	(81)
Income (Loss) from Continuing Operations, Total, Net of Tax		(39)	(40)	(85)	446
Reclassification of stranded tax effects
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax cut and jobs act reclassification from AOCI to retained earnings pension and postretirement benefit plans, before tax		0	0	0	527
Total reclassifications for the period		(39)	(40)	(85)	(81)
Accumulated foreign currency adjustment including portion attributable to noncontrolling interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax		0	0	0	(4)
Tax (expense)/benefit		0	0	0	0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		0	0	0	(4)
Accumulated net gain (loss) from cash flow hedges including portion attributable to noncontrolling interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax		(14)	0	(31)	(1)
Tax (expense)/benefit		5	0	11	0
Accumulated net gain (loss) from cash flow hedges including portion attributable to noncontrolling interest | Foreign Exchange Contract
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax	[2]	(14)	0	(31)	(1)
Net gains and loses on cash flow hedging derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		(9)	0	(20)	(1)
Tax cut and jobs act reclassification from AOCI to retained earnings pension and postretirement benefit plans, before tax		0	0	0	2
Income (Loss) from Continuing Operations, Total, Net of Tax		(9)	0	(20)	1
Total reclassifications for the period		$ (9)	$ 0	$ (20)	$ (1)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 19 for additional details).

[2] This accumulated other comprehensive income component is included in our derivatives and hedging activities (see Note 18 for additional details).