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, 2015	Mar. 31, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 15	$ 14
Interest cost	65	69
Expected return on plan assets	(118)	(116)
Amortization of actuarial loss	44	31
Amortization of prior service cost (credit)	1	1
Total net periodic benefit cost (credit)	7	(1)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	3	3
Amortization of actuarial loss	2	3
Amortization of prior service cost (credit)	(2)	(48)
Other	0	(4)
Total net periodic benefit cost (credit)	3	(46)
Real Estate Divestiture | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)		$ 1