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Supplemental financial information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other income (expense) net [Abstract]      
Interest income $ 11 $ 13 $ 24
Other (6) [1] 24 [1] 2 [1]
Total 5 37 26
Includes lease income primarily from the purchaser of a former business 20    
Non-cancellable future lease payments from the purchaser of a former business 84    
Property, plant and equipment at cost [Line Items]      
Property, plant and equipment at cost 7,133 6,907  
Authorizations for property, plant and equipment expenditures in future years 249    
Accrued expenses and other liabilities [Abstract]      
Customer incentive programs and allowances 190 118  
Severance and related expenses 140 19  
Property and other non-income taxes 98 108  
Other 367 377  
Total 795 622  
Accumulated other comprehensive income (loss), net of taxes [Abstract]      
Unrealized losses on available-for-sale investments (3) (13)  
Postretirement benefit plans [Abstract]      
Net actuarial loss (780) (704)  
Net prior service credit 9 16  
Cash flow hedge derivative (2) 0  
Total (776) (701)  
Land [Member]
      
Property, plant and equipment at cost [Line Items]      
Property, plant and equipment at cost 188 92  
Buildings and improvements [Member]
      
Property, plant and equipment at cost [Line Items]      
Property, plant and equipment at cost, depreciable lives, minimum 5    
Property, plant and equipment at cost, depreciable lives, maximum 40    
Property, plant and equipment at cost 2,998 2,815  
Machinery and equipment [Member]
      
Property, plant and equipment at cost [Line Items]      
Property, plant and equipment at cost, depreciable lives, minimum 3    
Property, plant and equipment at cost, depreciable lives, maximum 10    
Property, plant and equipment at cost $ 3,947 $ 4,000  
[1] Includes lease income of approximately $20 million per year, primarily from the purchaser of a former business. As of December 31, 2011, the aggregate amount of non-cancellable future lease payments to be received from these leases is $84 million. These leases contain renewal options. Other also includes miscellaneous non-operational items such as: interest income and expense related to non-investment items such as taxes; gains and losses from our equity method investments; realized gains and losses associated with former equity investments; gains and losses related to former businesses; gains and losses from currency exchange rate changes; and gains and losses from our derivative financial instruments, primarily forward foreign currency exchange contracts. 2011 also includes an expense associated with a settlement related to a divested business.