PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Change in Projected Benefit Obligations, Plan Assets and Funded Status of All Significant Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 22,500
Fair value of plan assets at end of year	24,900	$ 22,500
Non-US [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	(2,207)	(2,041)
Defined Benefit Pension Plans
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit obligations at beginning of year	29,600	31,851
Defined Benefit Plan, Benefit Obligation, Divestiture	(53)	(37)
Service cost	396	520	$ 506
Interest cost	921	886	883
Plan participants' contributions	12	19
Actuarial changes in assumptions and experience	3,904	(1,754)
Benefits paid	(1,684)	(1,476)
Plan amendments	0	17
Acquisition/divestiture/other	(37)	(45)
Effect of foreign exchange rates	14	(418)
Termination Benefits/curtailment cost/settlements	(174)	0
Benefit obligations at end of year	32,621	29,600	31,851
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	22,544	23,401
Actual return on plan assets	3,790	(742)
Employer contributions	266	1,656
Plan participants' contributions	12	19
Benefits paid	(1,684)	(1,476)
Effect of foreign exchange rates	41	(314)
Fair value of plan assets at end of year	24,908	22,544	$ 23,401
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Including Discontinued Operations	(7,713)	(7,056)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued and other current liabilities	(49)	(50)
Pension and other postretirement benefits - noncurrent	(8,287)	(7,227)
Net amount recognized	(7,713)	(7,056)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net loss (gain)	11,761	10,841
Prior service credit	(177)	(224)
Pretax balance in AOCL at end of year	$ 11,584	$ 10,617
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.81%	3.69%	3.17%
Defined Benefit Pension Plans | Discontinued Operations [Member]
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Divestiture	$ (331)	$ 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Divestiture	61	0
Funded status at end of year	0	(254)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued and other current liabilities	0	(270)
Other Postretirement Benefit Plans
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit obligations at beginning of year	1,478	1,567
Defined Benefit Plan, Benefit Obligation, Divestiture	0	0
Service cost	8	12	$ 14
Interest cost	49	45	54
Plan participants' contributions	0	0
Actuarial changes in assumptions and experience	148	(13)
Benefits paid	(148)	(123)
Plan amendments	0	0
Acquisition/divestiture/other	0	0
Effect of foreign exchange rates	3	(10)
Termination Benefits/curtailment cost/settlements	(3)	0
Benefit obligations at end of year	1,535	1,478	1,567
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Defined Benefit Plan, Plan Assets, Divestiture	0	0
Actual return on plan assets	0	0
Employer contributions	0	0
Plan participants' contributions	0	0
Benefits paid	0	0
Effect of foreign exchange rates	0	0
Fair value of plan assets at end of year	0	0	$ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Including Discontinued Operations	(1,535)	(1,478)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued and other current liabilities	(128)	(131)
Pension and other postretirement benefits - noncurrent	(1,407)	(1,347)
Net amount recognized	(1,535)	(1,478)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net loss (gain)	(147)	(315)
Prior service credit	0	0
Pretax balance in AOCL at end of year	$ (147)	$ (315)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.19%	4.24%
Other Postretirement Benefit Plans | Discontinued Operations [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	$ 0	$ 0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued and other current liabilities	0	0
UNITED STATES
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	$ (4,768)	$ (4,066)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.41%	4.39%
Pension Plan, Excluding Plans with Plan Assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	$ (738)	$ (695)
Other Postretirement Benefit Plans, Excluding Plans with Plan Assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	(1,535)	(1,478)
Deferred charges and other assets [Member] | Defined Benefit Pension Plans
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Assets for Plan Benefits, Defined Benefit Plan	623	491
Deferred charges and other assets [Member] | Other Postretirement Benefit Plans
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Assets for Plan Benefits, Defined Benefit Plan	$ 0	$ 0