PENSION AND POSTRETIREMENT BENEFIT PLANS (Changes in Defined Benefit and Postretirement Benefit Plan Assets and Obligations) (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
Fair value of plan assets at beginning of year	$ 6,461
Defined Benefit Plan, Plan Assets, Contributions by Employer	63	$ 71	$ 396
Fair value of plan assets at end of year	2,934	6,461
Assets for Plan Benefits, Defined Benefit Plan	456	809
Pension and other liabilities	(725)	(566)
Accumulated benefit obligation	2,900	6,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation
Benefit obligations at the beginning of year	5,966	6,749
Service cost - benefits earned during the year	26	26	25
Interest cost on projected benefit obligation	115	193	188
Settlements	(4,105)	(278)
Actuarial (gains)/losses	777	(523)
Benefits paid	(109)	(123)
Defined Benefit Plan, Benefit Obligation, Business Combination	262	0
Foreign currency and other	8	(78)
Benefit obligations at the end of the year	2,940	5,966	6,749
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	6,129	6,749
Actual return on plan assets	804	(203)
Defined Benefit Plan, Plan Assets, Contributions by Employer	63	71
Settlements	(4,104)	(276)
Benefits paid	(109)	(123)
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan	(424)	0
Defined Benefit Plan, Plan Assets, Business Combination	164	0
Exchange rate losses	13	(89)
Fair value of plan assets at end of year	2,536	6,129	$ 6,749
Funded Status	(404)	163
Assets for Plan Benefits, Defined Benefit Plan	192	622
Accrued liabilities	(27)	(32)
Pension and other liabilities	(569)	(427)
Net actuarial losses	1,192	2,717
Prior service credit	(26)	(30)
Total recognized in other comprehensive loss, pre-tax	$ 1,166	$ 2,687