Inventories by Major Category (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Supplemental Financial Information [Line Items]
Raw materials	$ 393	$ 368
Finished pulp, paper and packaging	1,673	1,503
Operating supplies	530	390
Other	71	59
Total	$ 2,667	$ 2,320