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Marketable Securities (Contractual maturity) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Marketable securities by contractual maturity    
Due in one year or less $ 382  
Due after one year through five years 15  
Due after five years through ten years 14  
Total marketable securities $ 411 $ 1,103