PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Costs (Credits) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 16	$ 14
Interest cost	60	65
Expected return on plan assets	(109)	(105)
Amortization of actuarial loss	55	42
Amortization of prior service cost (credit)	2	2
Total net periodic benefit cost (credit)	24	18
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	3	4
Amortization of actuarial loss	3	4
Amortization of prior service cost (credit)	(6)	(58)
Other	0	4
Total net periodic benefit cost (credit)	$ 0	$ (46)