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Marketable Securities (current and non-current) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable securities |  |
Current marketable securities | $ 380 | $ 1,076
Non-current marketable securities | 37 | 27
Total marketable securities | 417 | 1,103
Corporate debt securities |  |
Marketable securities |  |
Current marketable securities |  | 14
Commercial paper |  |
Marketable securities |  |
Current marketable securities | 366 | 899
Certificates of deposit/time deposits |  |
Marketable securities |  |
Current marketable securities | 10 | 76
U.S. municipal securities |  |
Marketable securities |  |
Current marketable securities | 3 | 3
Non-current marketable securities | 37 | 27
Asset-backed securities total |  |
Marketable securities |  |
Current marketable securities | 1 | 84
Asset-backed securities Automobile loan related |  |
Marketable securities |  |
Current marketable securities | $ 1 | 16
Asset-backed securities Credit card related |  |
Marketable securities |  |
Current marketable securities |  | $ 68

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