RETIREMENT AND OTHER BENEFIT PROGRAMS - Reconciliation of Pension and OPEB Plan Obligations, Assets and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Benefit obligations
End of period	$ 3,973
Fair value of plan assets
Beginning of period	4,774
End of period	2,973	$ 4,774
Pension benefits
Benefit obligations
Beginning of period	5,635	6,182
Service cost	74	87	$ 91
Interest cost	172	178	180
Participant contributions	4	5
Actuarial (gain) loss	924	(431)
Benefit payments	(267)	(259)
Settlements	(2,550)	(6)
Curtailment	(13)	(56)
Foreign exchange and other	(6)	(65)
End of period	3,973	5,635	6,182
Fair value of plan assets
Beginning of period	4,774	5,261
Actual return on plan assets	939	(237)
Employer contributions	69	51
Participant contributions	4	5
Benefit payments	(267)	(259)
Settlements	(2,550)	(6)
Foreign exchange and other	4	(41)
End of period	2,973	4,774	5,261
43830	(1,000)	(861)
Amounts recognized in the consolidated balance sheets
Noncurrent asset	77	60
Current liability	(25)	(25)
Noncurrent liability	(1,052)	(896)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total	(1,000)	(861)
OPEB
Benefit obligations
Beginning of period	211	235
Service cost	1	1	1
Interest cost	8	7	7
Participant contributions	0	0
Actuarial (gain) loss	26	(14)
Benefit payments	(18)	(18)
Settlements	0	0
Curtailment	0	0
Foreign exchange and other	0	0
End of period	228	211	235
Fair value of plan assets
Beginning of period	0	0
Actual return on plan assets	0	0
Employer contributions	18	18
Participant contributions	0	0
Benefit payments	(18)	(18)
Settlements	0	0
Foreign exchange and other	0	0
End of period	0	0	$ 0
43830	(228)	(211)
Amounts recognized in the consolidated balance sheets
Noncurrent asset	0	0
Current liability	(20)	(20)
Noncurrent liability	(208)	(191)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total	$ (228)	$ (211)