PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 95	$ 86
Interest cost	274	278
Expected return on plan assets	(316)	(323)
Amortization of prior service cost (credit)	7	7
Amortization of net loss	130	92
Net periodic benefit cost	190	140
Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	4	3
Interest cost	23	25
Expected return on plan assets	0	(1)
Amortization of prior service cost (credit)	(1)	0
Net periodic benefit cost	$ 26	$ 27