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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Deferred tax (assets) and liabilities comprise the following (in millions):
| 2019 |  | 2018
Excess of tax over book depreciation | $ | 1,233 |  |  | $ | 1,066 |
Intangibles - net | 16 |  |  | 15 |
Operating lease liabilities | 416 |  |  | — |
Other - net | 58 |  |  | 43 |
Deferred tax liabilities | 1,723 |  |  | 1,124 |
Mileage Plan™ | (337) |  |  | (315) |
Inventory obsolescence | (15) |  |  | (15) |
Employee benefits | (179) |  |  | (172) |
Acquired net operating losses | (13) |  |  | (64) |
Operating lease assets | (417) |  |  | — |
Other - net | (48) |  |  | (48) |
Deferred tax assets | (1,009) |  |  | (614) |
Valuation allowance | 1 |  |  | 2 |
Net deferred tax liabilities | $ | 715 |  |  | $ | 512 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of income tax expense are as follows (in millions):
| 2019 |  | 2018 |  | 2017
Current income tax expense (benefit): |  |  |  |  |
Federal | $ | 26 |  |  | $ | (5) |  |  | $ | 127 |
State | 13 |  |  | 9 |  |  | 35 |
Total current income tax expense | 39 |  |  | 4 |  |  | 162 |
Deferred income tax expense (benefit): |  |  |  |  |  |  |  |
Federal | 175 |  |  | 125 |  |  | (3) |
State | 33 |  |  | 19 |  |  | 40 |
Total deferred income tax expense (benefit) | 208 |  |  | 144 |  |  | 37 |
Income tax expense | $ | 247 |  |  | $ | 148 |  |  | $ | 199 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
| 2019 |  | 2018 |  | 2017
Income before income tax | $ | 1,016 |  |  | $ | 585 |  |  | $ | 1,159 |
Expected tax expense | 213 |  |  | 123 |  |  | 406 |
Nondeductible expenses | 9 |  |  | 9 |  |  | 5 |
State income taxes | 36 |  |  | 21 |  |  | 28 |
State income sourcing | 1 |  |  | — |  |  | 9 |
Tax law changes | (9) |  |  | (7) |  |  | (237) |
Other - net | (3) |  |  | 2 |  |  | (12) |
Actual tax expense | $ | 247 |  |  | $ | 148 |  |  | $ | 199 |
Effective tax rate | 24.3 | % |  | 25.3 | % |  | 17.2 | %
Summary of Income Tax Contingencies [Table Text Block] | The Company has identified its federal tax return and its state tax returns in Alaska, Oregon and California as “major” tax jurisdictions. A summary of the Company's jurisdictions and the periods that are subject to examination are as follows:
Jurisdiction | Period
Federal | 2007 to 2018
Alaska | 2015 to 2018
California | 2007 to 2018
Oregon | 2003 to 2018
Certain tax years are open to the extent of net operating loss carryforwards. Changes in the liability for gross unrecognized tax benefits during 2019, 2018 and 2017 are as follows (in millions):
| 2019 |  | 2018 |  | 2017
Balance at January 1, | $ | 40 |  |  | $ | 43 |  |  | $ | 40 |
Additions related to prior years | — |  |  | 1 |  |  | 16 |
Releases related to prior years | (1) |  |  | (4) |  |  | (2) |
Additions related to current year activity | 2 |  |  | 2 |  |  | 2 |
Releases due to settlements | — |  |  | (1) |  |  | (11) |
Releases due to lapse of statute of limitations | (1) |  |  | (1) |  |  | (2) |
Balance at December 31, | $ | 40 |  |  | $ | 40 |  |  | $ | 43 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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