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, 2012	Mar. 31, 2011
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 12
Interest cost	65	69
Expected return on plan assets	(105)	(105)
Amortization of actuarial loss	42	35
Amortization of prior service costs (credits)	2	4
Loss due to curtailment and special termination benefits	0	1
Total net periodic benefit costs (credits)	18	16
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	4	6
Amortization of actuarial loss	4	3
Amortization of prior service costs (credits)	(58)	(6)
Adjustments	4	4
Total net periodic benefit costs (credits)	$ (46)	$ 8