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, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 11		$ 13	$ 24	$ 28
Interest cost	69		68	137	133
Expected return on plan assets	(123)		(121)	(246)	(239)
Amortization of actuarial loss	40		47	78	91
Amortization of prior service cost (credit)	1		1	2	2
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	0		0	5	0
Total net periodic benefit cost (credit)	(2)		8	0	15
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	3		2	5	5
Amortization of actuarial loss	2		3	4	5
Amortization of prior service cost (credit)	(2)		(2)	(4)	(4)
Total net periodic benefit cost (credit)	3		3	5	6
Plum Creek [Member]
Defined Benefit Plan Disclosure [Line Items]
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	0	$ 5	0	5	0
Discontinued operations | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 3		$ 5	$ 7	$ 8