PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes in Fair Value of Plan Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets		$ 27	$ 226	$ 368
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year (estimated)		5,491	5,643
Adjustment for final fair value of plan assets	$ 7	7	57
Actual return on plan assets		27	226
Foreign currency translation		29	(155)
Employer contributions and benefit payments		78	60
Plan participants’ contributions		0	0
Plan transfers		1	2
Plan acquisitions		137	0
Benefits paid (includes lump sum settlements)		(419)	(342)
Fair value of plan assets at end of year (estimated)		5,351	5,491	5,643
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year (estimated)		0	0
Adjustment for final fair value of plan assets		0	0
Actual return on plan assets		0	0
Foreign currency translation		0	0
Employer contributions and benefit payments		21	23
Plan participants’ contributions		7	9
Plan transfers		0	0
Plan acquisitions		0	0
Benefits paid (includes lump sum settlements)		(28)	(32)
Fair value of plan assets at end of year (estimated)		$ 0	$ 0	$ 0