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Fair value measurements (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Fair value measurements using quoted prices in active markets for identical financial instruments (Level 1)
  
Financial assets  
Money market funds$ 2,329$ 2,216
U.S. treasuries and foreign government bonds with original maturities of three months or less 332
U.S. treasuries with original maturies of three months or less11 
U.S. treasuries and government sponsored agency debt securities391672
ARS held through Morgan Stanley Smith Barney LLC00
Foreign exchange contract derivatives, assets 0
Total financial assets at fair value2,7313,220
Fair value measurements using significant other observable inputs (Level 2)
  
Financial assets  
Money market funds00
U.S. treasuries and foreign government bonds with original maturities of three months or less 0
U.S. treasuries with original maturies of three months or less0 
U.S. treasuries and government sponsored agency debt securities00
ARS held through Morgan Stanley Smith Barney LLC00
Foreign exchange contract derivatives, assets 1
Total financial assets at fair value01
Fair value measurements using significant unobservable inputs (Level 3)
  
Financial assets  
Money market funds00
U.S. treasuries and foreign government bonds with original maturities of three months or less 0
U.S. treasuries with original maturies of three months or less0 
U.S. treasuries and government sponsored agency debt securities00
ARS held through Morgan Stanley Smith Barney LLC2523
Foreign exchange contract derivatives, assets 0
Total financial assets at fair value2523
Fair value
  
Financial assets  
Money market funds2,3292,216
U.S. treasuries and foreign government bonds with original maturities of three months or less 332
U.S. treasuries with original maturies of three months or less11 
U.S. treasuries and government sponsored agency debt securities391672
ARS held through Morgan Stanley Smith Barney LLC2523
Foreign exchange contract derivatives, assets 1
Total financial assets at fair value$ 2,756$ 3,244