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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 13	$ 14	$ 37	$ 42
Interest cost	70	65	207	198
Expected return on plan assets	(125)	(115)	(371)	(354)
Amortization of actuarial loss	39	44	117	135
Amortization of prior service cost (credit)	1	1	3	3
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	0	0	5	0
Total net periodic benefit cost (credit)	(2)	9	(2)	24
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	2	7	7
Amortization of actuarial loss	2	2	6	7
Amortization of prior service cost (credit)	(2)	(2)	(6)	(6)
Total net periodic benefit cost (credit)	2	2	7	8
Discontinued operations | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 3	$ 5	$ 10	$ 13