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Marketable Securities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities |  |
Current marketable securities | $ 501 | $ 404
Non-current marketable securities | 31 | 30
Total marketable securities | 532 | 434
Corporate debt securities |  |
Marketable Securities |  |
Current marketable securities | 7 | 7
Commercial paper |  |
Marketable Securities |  |
Current marketable securities | 384 | 237
Certificates of deposit/time deposits |  |
Marketable Securities |  |
Current marketable securities | 7 | 31
U.S. treasury securities |  |
Marketable Securities |  |
Current marketable securities | 100 | 125
U.S. municipal securities |  |
Marketable Securities |  |
Current marketable securities | 3 | 4
Non-current marketable securities | $ 31 | $ 30

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