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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Indefinite-lived Intangible Assets [Line Items]        
Maturity period of investments description   Three months or less    
Minimum Derivative Financial Instrument's Term (Months)   2 months    
Maximum Derivative Financial Instrument's Term (Months)   24 months    
Derivative Assets   $ 105 $ 26  
Derivative Liabilities   19 96  
Fair Value of Foreign Currency Forward Contracts   86    
Allowances for excess and obsolete inventories   338 281  
Depreciation expense related to property, plant and equipment   323 279 262
Impairment of long-lived assets   0 0 0
Goodwill   7,172 6,151 5,790
Indefinite-lived intangible assets   4,743 4,073  
Estimated useful lives of intangible assets, Minimum   2 years    
Estimated useful lives of intangible assets, Maximum   30 years    
Amortization expense   300    
Number of years as first period of amortization   5 years    
Net foreign currency transaction gains (losses)   21 10 30
Devalued asset charges 27 12    
Written down charges of accounts receivable   11    
Net investment in Venezuela   34    
Net allowances for doubtful accounts   120 107  
Compensation cost charged against income for share-based compensation arrangements   80 73 66
Income tax benefit recognized for share-based compensation arrangements   24 17 20
Anti-dilutive stock options outstanding   5 3 8
Fair Value, Inputs, Level 2 [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Derivative Assets   105    
Derivative Liabilities   19    
Trade Names [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets   $ 643