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Marketable Securities (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Contractual maturities of marketable securities    
Due in 1 year or less, amortized cost $ 79  
Due in 1 year or less, fair value 79  
Due in 1-5 years, amortized cost 59  
Due in 1-5 years, fair value 59  
Marketable securities, amortized cost 138 142
Marketable securities, fair value $ 138 $ 142