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Marketable Securities (Details 1) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Contractual maturities of marketable securities    
Due in 1 year or less, amortized cost $ 100  
Due in 1 year or less, fair value 100  
Due in 1-5 years, amortized cost 38  
Due in 1-5 years, fair value 38  
Marketable securities, amortized cost 138 131
Marketable securities, fair value $ 138 $ 131