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Marketable Securities - Current and non-current (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable Securities |  |
Current marketable securities | $ 224 | $ 98
Non-current marketable securities | 34 | 43
Total marketable securities | 258 | 141
Commercial paper |  |
Marketable Securities |  |
Current marketable securities | 194 | 85
Certificates of deposit/time deposits |  |
Marketable Securities |  |
Current marketable securities | 6 | 10
U.S. municipal securities |  |
Marketable Securities |  |
Current marketable securities | 24 | 3
Non-current marketable securities | $ 34 | $ 43

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