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Marketable Securities (Details 1) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Marketable Securities (Textual) [Abstract] 
Proceeds received from sales and maturities of marketable securities$ 251
Contractual maturities of marketable securities 
Due in 1 year or less, amortized cost161
Due in 1 year or less, fair value161
Due in 1-5 years, amortized cost160
Due in 1-5 years, fair value160
Due in more than 5 years, amortized cost0
Due in more than 5 years fair Value0
Marketable securities, amortized cost321
Available-for-sale Debt Securities Fair Value$ 321