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DERIVATIVE INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | Fair values of derivative instruments on the consolidated balance sheet (in millions):
| 2019 |  | 2018
Fuel hedge contracts (not designated as hedges) |  |  |
Prepaid expenses and other current assets | $ | 8 |  |  | $ | 2 |
Other assets | 3 |  |  | 2 |
Interest rate swaps (designated as hedges) |  |  |
Prepaid expenses and other current assets | 1 |  |  | 3 |
Other noncurrent assets | 2 |  |  | 7 |
Other accrued liabilities | (5) |  |  | (3) |
Other liabilities | (5) |  |  | (4) |
Losses in accumulated other comprehensive loss (AOCL) | (13) |  |  | (1) |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] | Pretax effect of derivative instruments on earnings and AOCL (in millions):
| 2019 |  | 2018 |  | 2017
Fuel hedge contracts (not designated as hedges) |  |  |  |  |
Gains (losses) recognized in Aircraft fuel | $ | (10) |  |  | $ | 1 |  |  | $ | (6) |
Interest rate swaps (designated as hedges) |  |  |  |  |
Losses recognized in Aircraft rent | (3) |  |  | (3) |  |  | (5) |
Gains (losses) recognized in other comprehensive income (OCI) | (13) |  |  | — |  |  | 1 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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