PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes in Fair Value of Plan Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	$ 368	$ 808	$ 490
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	5,614	5,022
Adjustment for final fair value of plan assets	53	55		53
Actual return on plan assets	368	808
Foreign currency exchange rate changes	(75)	(57)
Employer contributions and benefit payments	70	103
Plan participants’ contributions	0	0
Plan transfer/Acquisitions	4	0
Benefits paid (includes lump sum settlements)	(391)	(317)
Fair value of plan assets, ending	5,643	5,614
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	0	0
Adjustment for final fair value of plan assets	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions and benefit payments	31	34
Plan participants’ contributions	13	16
Plan transfer/Acquisitions	0	0
Benefits paid (includes lump sum settlements)	(44)	(50)
Fair value of plan assets, ending	$ 0	$ 0