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Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives (Parenthetical) (Detail) (USD $)
 12 Months Ended 84 Months Ended 12 Months Ended
Jun. 28, 2009
Jun. 03, 2009
Wyeth [Member]
Mar. 24, 2009
Wyeth [Member]
Mar. 12, 2009
Wyeth [Member]
Dec. 31, 2011
Employee termination costs [Member]
Dec. 31, 2011
Employee termination costs [Member]
Employee
Dec. 31, 2011
Primary Care [Member]
Dec. 31, 2010
Primary Care [Member]
Dec. 31, 2011
Specialty Care And Oncology [Member]
Dec. 31, 2010
Specialty Care And Oncology [Member]
Dec. 31, 2011
Established Products and Emerging Markets [Member]
Dec. 31, 2010
Established Products and Emerging Markets [Member]
Dec. 31, 2011
Animal Health and Consumer Healthcare operating segment [Member]
Dec. 31, 2010
Animal Health and Consumer Healthcare operating segment [Member]
Dec. 31, 2009
Animal Health and Consumer Healthcare operating segment [Member]
Dec. 31, 2011
Nutrition [Member]
Dec. 31, 2010
Nutrition [Member]
Dec. 31, 2009
Nutrition [Member]
Dec. 31, 2011
Research and Development Operations [Member]
Dec. 31, 2010
Research and Development Operations [Member]
Dec. 31, 2009
Research and Development Operations [Member]
Dec. 31, 2011
Manufacturing Operations [Member]
Dec. 31, 2010
Manufacturing Operations [Member]
Dec. 31, 2009
Manufacturing Operations [Member]
Dec. 31, 2011
Corporate [Member]
Dec. 31, 2010
Corporate [Member]
Dec. 31, 2009
Corporate [Member]
Dec. 31, 2009
Biopharmaceutical operating segments [Member]
Restructuring Cost and Reserve [Line Items]                                                        
Unused Bridge Loan       $ 22,500,000,000                                                
Senior unsecured notes 24,000,000,000 10,500,000,000 13,500,000,000                                                  
Estimated Employee Terminations           57,400                                            
Restructuring and Related Activities, Initiation Date         Jan. 01, 2005                                              
Restructuring and Related Activities, Current Date         Dec. 31, 2011                                              
Actual Employees Terminated           42,800                                            
Restructuring charges             $ 593,000,000 $ 71,000,000 $ 220,000,000 $ 197,000,000 $ 110,000,000 $ 43,000,000 $ 51,000,000 $ 46,000,000 $ 250,000,000 $ 4,000,000 $ 4,000,000 $ (4,000,000) $ 489,000,000 $ 292,000,000 $ 339,000,000 $ 280,000,000 $ 1,100,000,000 $ 292,000,000 $ 427,000,000 $ 455,000,000 $ 781,000,000 $ 1,300,000,000