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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2020
Accounting Policies [Abstract] |
Schedule of marketable securities | The aggregate carrying values of our short-term and long-term investment securities consisted of the following at September 30, 2020 and December 31, 2019 (in millions):
| September 30, 2020 |  | December 31, 2019
Available-for-sale securities |  |  |
Time deposits | $ | 561 |  |  | $ | 325 |
Commercial paper | — |  |  | 20 |
Debt securities | 8 |  |  | 6 |
Total available-for-sale securities | 569 |  |  | 351 |
Held-to-maturity securities |  |  |
Corporate bonds | — |  |  | 21 |
Total held-to-maturity securities | — |  |  | 21 |
Total investment securities | $ | 569 |  |  | $ | 372 |

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