RETIREMENT BENEFITS - Net (Benefit) Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure
Percentage of the significant plans over global pension and postretirement liabilities, which utilize quarterly measurement policy	90.00%
U.S. Pension Plans
Amortization of unrecognized
Total net (benefit) expense	$ (35)	$ (41)
U.S. Qualified Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the year	2	2
Interest cost on benefit obligation	137	140
Expected return on plan assets	(222)	(217)
Amortization of unrecognized
Prior service (benefit) cost	(1)	(1)
Net actuarial loss	37	23
Total net (benefit) expense	(47)	(53)
U.S. Nonqualified Pension Plan
Amortization of unrecognized
Total net (benefit) expense	12	12
Non - U.S. Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the year	44	46
Interest cost on benefit obligation	80	96
Expected return on plan assets	(84)	(95)
Amortization of unrecognized
Prior service (benefit) cost	0	1
Net actuarial loss	21	20
Total net (benefit) expense	61	68
U.S. Postretirement Benefit Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the year	0	0
Interest cost on benefit obligation	8	8
Expected return on plan assets	0	(1)
Amortization of unrecognized
Prior service (benefit) cost	0	0
Net actuarial loss	0	(1)
Total net (benefit) expense	8	6
Non-U.S. Postretirement Benefit Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the year	4	4
Interest cost on benefit obligation	27	29
Expected return on plan assets	(29)	(30)
Amortization of unrecognized
Prior service (benefit) cost	(3)	(3)
Net actuarial loss	11	9
Total net (benefit) expense	$ 10	$ 9