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Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2020
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 March 31, 2020 and December 31, 2019 (in millions):
| March 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Cash equivalents | $ | 1,114 |  |  | $ | 140 |  |  | $ | — |  |  | $ | 1,254 |
Available-for-sale investment securities | — |  |  | 163 |  |  | — |  |  | 163 |
Aircraft fuel derivatives | — |  |  | 1 |  |  | — |  |  | 1 |
| December 31, 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Cash equivalents | $ | 611 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 641 |
Available-for-sale investment securities | — |  |  | 351 |  |  | — |  |  | 351 |
Aircraft fuel derivatives | — |  |  | 8 |  |  | — |  |  | 8 |
Refer to Note 4 to our condensed consolidated financial statements for fair value information related to our outstanding debt obligations as of March 31, 2020 and December 31, 2019.

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