PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Costs (Credits) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 13	$ 13	$ 28	$ 27
Interest cost	68	69	133	138
Expected return on plan assets	(121)	(116)	(239)	(232)
Amortization of actuarial loss	47	30	91	61
Amortization of prior service cost (credit)	1	2	2	3
Total net periodic benefit cost (credit)	8	(2)	15	(3)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	2	5	5
Amortization of actuarial loss	3	3	5	6
Amortization of prior service cost (credit)	(2)	(47)	(4)	(95)
Other	0	0	0	(4)
Total net periodic benefit cost (credit)	$ 3	(42)	$ 6	(88)
Real Estate Divestiture | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)		$ 1		$ 2