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Marketable Securities (current and non-current) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Marketable securities classification    
Current marketable securities $ 141 $ 280
Non-current marketable securities 17 17
Total marketable securities 158 297
Corporate debt securities    
Marketable securities classification    
Current marketable securities 10 10
Commercial paper    
Marketable securities classification    
Current marketable securities 1 14
Certificates of deposit/time deposits    
Marketable securities classification    
Current marketable securities 89 197
U.S. municipal securities    
Marketable securities classification    
Current marketable securities 3 3
Non-current marketable securities 17 17
Asset-backed securities total    
Marketable securities classification    
Current marketable securities 38 56
Asset-backed securities Automobile loan related    
Marketable securities classification    
Current marketable securities 29 31
Asset-backed securities Credit card related    
Marketable securities classification    
Current marketable securities $ 9 18
Asset-backed securities Other asset-backed securities    
Marketable securities classification    
Current marketable securities   $ 7