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Financial Instruments and Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Carrying Value [Member]
Dec. 31, 2010
Carrying Value [Member]
Sep. 30, 2011
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Notes Fixed Rate 2.625% [Member]
Jun. 30, 2011
Notes Fixed Rate 1.25% [Member]
Debt Instrument [Line Items]      
Long-term debt$ 4,689$ 3,376$ 5,020$ 3,613  
Face amount    $ 250$ 250
Term of notes    6 years3 years
Interest rate on notes issued (in hundredths)    2.625%1.25%