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Marketable Securities (current and non-current) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable securities |  |
Current marketable securities | $ 539 | $ 380
Non-current marketable securities | 46 | 37
Total marketable securities | 585 | 417
Corporate debt securities |  |
Marketable securities |  |
Current marketable securities | 16 |
Commercial paper |  |
Marketable securities |  |
Current marketable securities | 510 | 366
Certificates of deposit/time deposits |  |
Marketable securities |  |
Current marketable securities | 10 | 10
U.S. municipal securities |  |
Marketable securities |  |
Current marketable securities | 3 | 3
Non-current marketable securities | $ 46 | 37
Asset-backed securities |  |
Marketable securities |  |
Current marketable securities |  | $ 1

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