FAIR VALUE MEASUREMENTS (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0				$ 0				$ 0	$ 0
Noncash settlement transactions										23
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Restructuring, goodwill impairment and asset related charges - net	2,851	$ 147	$ 65	$ 156	46	$ 48	$ 40	$ 87	3,219	221	$ 2,739
Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Jan 1				$ 0				$ 677	0	677
Gain (loss) included in earnings										3
Settlements										(680)
Balance at Dec 31					0					0	$ 677
Fair Value, Measurements, Nonrecurring | Fair Value Measured at Net Asset Value Per Share | Private Market Securities and Real Estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unfunded commitments on investments	76				89				76	89
Fair Value, Measurements, Nonrecurring | Fair Value Measured at Net Asset Value Per Share | Private Market Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets at fair value:	117				120				117	120
Fair Value, Measurements, Nonrecurring | Fair Value Measured at Net Asset Value Per Share | Real Estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets at fair value:	$ 18				$ 29				$ 18	$ 29