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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
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 March 31, 2021 and December 31, 2020 (in millions):
| March 31, 2021 |  | December 31, 2020
Available-for-sale securities |  |  |
Time deposits | $ | 860 |  |  | $ | 1,130 |
Debt securities | 7 |  |  | 7 |
Total available-for-sale securities | 867 |  |  | 1,137 |
Total investment securities | $ | 867 |  |  | $ | 1,137 |

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