INCOME TAXES - Items Excluded from Effective Income Tax Rates (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012 Income taxes on postretirement plan amendment discussed in Note 10	Mar. 31, 2012 Income taxes on postretirement plan amendment discussed in Note 10	Mar. 31, 2012 State income tax settlements	Jun. 30, 2012 Income tax settlements	Mar. 31, 2011 Income taxes on a non-strategic timberlands gain discussed in Note 6	Jun. 30, 2011 Tax benefit on early extinguishment of debt discussed in Note 9
Income tax credit (charge) that is excluded from the companys effective income tax rate	$ (18)	$ (18)	$ 8	$ (3)	$ (56)	$ 10