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FINANCIAL DERIVATIVE INSTRUMENTS - Fair Values by Balance Sheet Location (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | $ 86 | $ 352
Gross amounts offset in the balance sheet | 15 | 106
Cash collateral deposits held from counterparties for fuel contracts - current | 15 | 106
Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 137 | 160
Gross amounts offset in the balance sheet | 35 | 0
Cash collateral deposits held from counterparties for fuel contracts - current | 35 | 0
Fuel derivative contracts | Accounts and other receivables |  |
Derivatives, Fair Value |  |
Receivable from third parties for fuel contracts | 12 | 34
Interest rate derivatives | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 0 | 14
Designated as Hedging Instrument |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 223 | 526
Gross amounts offset in the balance sheet | 0 | 0
Designated as Hedging Instrument | Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 86 | 352
Gross amounts offset in the balance sheet | 0 | 0
Designated as Hedging Instrument | Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 137 | 160
Gross amounts offset in the balance sheet | 0 | 0
Designated as Hedging Instrument | Interest rate derivatives | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 0 | 14
Gross amounts offset in the balance sheet | $ 0 | $ 0

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other 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 assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-22 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-7 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (c)(2) -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4D + Details
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