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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2022
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 (in millions):
|  | As of December 31, 2022
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 665 |  |  | $ | — |  |  | $ | — |  |  | $ | 665 |
Available-for-sale investment securities |  | — |  |  | 324 |  |  | 13 |  |  | 337 |
Equity Investment Securities |  | 8 |  |  | — |  |  | — |  |  | 8 |
Aircraft fuel derivatives |  | — |  |  | 3 |  |  | — |  |  | 3 |
|  | As of December 31, 2021
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 1,515 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,515 |
Available-for-sale investment securities |  | — |  |  | 800 |  |  | — |  |  | 800 |
Equity investment securities |  | 26 |  |  | — |  |  | — |  |  | 26 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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