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Marketable Securities (Details 1) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Contractual maturities of marketable securities    
Due in 1 year or less, amortized cost $ 64  
Due in 1-5 years, amortized cost 36  
Marketable securities, amortized cost 100 142
Due in 1 year or less, fair value 64  
Due in 1-5 years, fair value 36  
Marketable securities, fair value $ 100 $ 142