PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Costs (Credits) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 16	$ 12	$ 32	$ 26
Interest cost	62	66	122	131
Expected return on plan assets	(111)	(105)	(220)	(210)
Amortization of actuarial loss	56	45	111	87
Amortization of prior service cost (credit)	1	2	3	4
Total net periodic benefit cost (credit)	24	20	48	38
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	3	3	6	7
Amortization of actuarial loss	4	3	7	7
Amortization of prior service cost (credit)	(6)	(57)	(12)	(115)
Other	2	0	2	4
Total net periodic benefit cost (credit)	$ 4	$ (50)	$ 4	$ (96)