Number of Cases Pending (Detail)	Feb. 14, 2014 Conventional Product Liability Cases Subsequent Event LegalMatter	Dec. 31, 2013 Engle Progeny Cases LegalMatter	Feb. 14, 2014 Engle Progeny Cases Subsequent Event LegalMatter	Feb. 14, 2014 West Virginia Individual Personal Injury Cases Subsequent Event LegalMatter	Feb. 14, 2014 Flight Attendant Cases Subsequent Event LegalMatter	Feb. 11, 2013 Class Action Cases LegalMatter	Feb. 14, 2014 Class Action Cases Subsequent Event LegalMatter	Feb. 14, 2014 Reimbursement Cases Subsequent Event LegalMatter	Feb. 14, 2014 Filter Cases Subsequent Event LegalMatter	Feb. 14, 2014 Tobacco-Related Antitrust Cases Subsequent Event LegalMatter
Loss Contingencies [Line Items]
Loss contingency pending claims number	23	3	4,197	38	2,572	1	1	1	62	1