PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 117	$ 95	$ 352	$ 285
Interest cost	252	274	757	822
Expected return on plan assets	(311)	(316)	(934)	(948)
Amortization of prior service cost	6	6	18	19
Amortization of net loss	197	130	591	390
Net periodic benefit cost	261	189	784	568
Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	5	4	15	12
Interest cost	20	23	60	69
Amortization of prior service cost	(1)	(1)	(3)	(3)
Net periodic benefit cost	$ 24	$ 26	$ 72	$ 78