PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Costs (Credits) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Loss due to curtailment and special termination benefits(2)	$ 0	$ 3	$ 0	$ 3
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	14	13	42	40
Interest cost	65	67	198	205
Expected return on plan assets	(115)	(117)	(354)	(349)
Amortization of actuarial loss	44	33	135	94
Amortization of prior service cost (credit)	1	1	3	4
Loss due to curtailment and special termination benefits(2)	0	9	0	9
Total net periodic benefit cost (credit)	9	6	24	3
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	3	7	8
Amortization of actuarial loss	2	3	7	9
Amortization of prior service cost (credit)	(2)	(25)	(6)	(120)
Other	0	0	0	(4)
Total net periodic benefit cost (credit)	$ 2	$ (19)	$ 8	(107)
Real Estate Divestiture | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)				$ 2