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Marketable Securities (current and non-current) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Marketable Securities    
Current marketable securities $ 385 $ 1,076
Non-current marketable securities 26 27
Total marketable securities 411 1,103
Corporate debt securities    
Marketable Securities    
Current marketable securities   14
Commercial paper    
Marketable Securities    
Current marketable securities 347 899
Certificates of deposit/time deposits    
Marketable Securities    
Current marketable securities 31 76
U.S. municipal securities    
Marketable Securities    
Current marketable securities 4 3
Non-current marketable securities 26 27
Asset-backed securities total    
Marketable Securities    
Current marketable securities 3 84
Asset-backed securities Automobile loan related    
Marketable Securities    
Current marketable securities $ 3 16
Asset-backed securities Credit card related    
Marketable Securities    
Current marketable securities   $ 68