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Fair Value (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Fair value, by balance sheet grouping | The following is a listing of our assets and liabilities required to be measured at fair value on a recurring basis and where they are classified within the fair value hierarchy as of June 30, 2021 and December 31, 2020 (in millions):
| June 30, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Cash equivalents | $ | 1,740 |  |  | $ | 100 |  |  | $ | — |  |  | $ | 1,840 |
Available-for-sale investment securities | — |  |  | 1,318 |  |  | — |  |  | 1,318 |
| December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Cash equivalents | $ | 1,330 |  |  | $ | 130 |  |  | $ | — |  |  | $ | 1,460 |
Available-for-sale investment securities | — |  |  | 1,137 |  |  | — |  |  | 1,137 |
Refe r to Note 3 to ou r condensed consolidated financial statements for fair value information related to our outstanding debt obligations as of June 30, 2021 and December 31, 2020.

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