Fair Value Measurements - Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions |
Sep. 30, 2022 |
Dec. 31, 2021 |
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| Fair Value | ||
| Cash equivalents | $ 4,443 | $ 5,450 |
| Restricted cash equivalents | 302 | 635 |
| Short-term investments | 1,345 | 3,386 |
| Long-term investments | 899 | 1,459 |
| Fuel hedge contracts | 23 | (18) |
| Level 1 | ||
| Fair Value | ||
| Cash equivalents | 4,443 | 5,450 |
| Restricted cash equivalents | 302 | 635 |
| Short-term investments | 75 | 1,376 |
| Long-term investments | 767 | 1,326 |
| Fuel hedge contracts | 0 | 0 |
| Level 2 | ||
| Fair Value | ||
| Cash equivalents | 0 | 0 |
| Restricted cash equivalents | 0 | 0 |
| Short-term investments | 1,270 | 2,010 |
| Long-term investments | 35 | 36 |
| Fuel hedge contracts | 23 | (18) |
| Level 3 | ||
| Fair Value | ||
| Cash equivalents | 0 | 0 |
| Restricted cash equivalents | 0 | 0 |
| Short-term investments | 0 | 0 |
| Long-term investments | 97 | 97 |
| Fuel hedge contracts | $ 0 | $ 0 |
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. No definition available.
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The aggregate value of all restricted investments. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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