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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Components of Income Tax Expense (Benefit) | The significant components of the income tax expense (benefit) are as follows (in millions):
2016 |  | UAL |  |  | United |
Current |  | $ | (92) |  |  | $ | (92) |
Deferred |  |  | 1,648 |  |  |  | 1,650 |
|  | $ | 1,556 |  |  | $ | 1,558 |
2015 |  |  |  |  |  |
Current |  | $ | 56 |  |  | $ | 56 |
Deferred |  |  | (3,177) |  |  |  | (3,136) |
|  | $ | (3,121) |  |  | $ | (3,080) |
2014 |  |  |  |  |  |
Current |  | $ | (17) |  |  | $ | (17) |
Deferred |  |  | 13 |  |  |  | 13 |
|  | $ | (4) |  |  | $ | (4) |
Income Tax Provision Differed from Amounts Computed at Statutory Federal Income Tax Rate | The income tax provision differed from amounts computed at the statutory federal income tax rate, as follows (in millions):
UAL |  | 2016 |  |  | 2015 |  |  | 2014 |
Income tax provision at statutory rate |  | $ | 1,337 |  |  | $ | 1,477 |  |  | $ | 395 |
State income taxes, net of federal income tax |  |  | 38 |  |  |  | 38 |  |  |  | 10 |
Foreign income taxes |  |  | 3 |  |  |  | 4 |  |  |  | 2 |
Nondeductible employee meals |  |  | 16 |  |  |  | 15 |  |  |  | 15 |
Income tax adjustment |  |  | 180 |  |  |  | — |  |  |  | — |
State rate change |  |  | (12) |  |  |  | — |  |  |  | — |
Valuation allowance |  |  | 20 |  |  |  | (4,662) |  |  |  | (435) |
Other, net |  |  | (26) |  |  |  | 7 |  |  |  | 9 |
|  | $ | 1,556 |  |  | $ | (3,121) |  |  | $ | (4) |
United |  | 2016 |  |  | 2015 |  |  | 2014 |
Income tax provision at statutory rate |  | $ | 1,338 |  |  | $ | 1,477 |  |  | $ | 388 |
State income taxes, net of federal income tax |  |  | 38 |  |  |  | 38 |  |  |  | 10 |
Foreign income taxes |  |  | 3 |  |  |  | 4 |  |  |  | 2 |
Nondeductible employee meals |  |  | 16 |  |  |  | 15 |  |  |  | 15 |
Derivative market adjustment |  |  | — |  |  |  | — |  |  |  | (7) |
Income tax adjustment |  |  | 180 |  |  |  | — |  |  |  | — |
State rate change |  |  | (12) |  |  |  | — |  |  |  | — |
Valuation allowance |  |  | 20 |  |  |  | (4,621) |  |  |  | (421) |
Other, net |  |  | (25) |  |  |  | 7 |  |  |  | 9 |
|  | $ | 1,558 |  |  | $ | (3,080) |  |  | $ | (4) |
Components of Deferred Tax Assets and Liabilities | Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2016 and 2015 were as follows (in millions):
|  | UAL |  |  | United |
|  | December 31, |  |  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Deferred income tax asset (liability): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal and state net operating loss (“NOL”) carryforwards |  | $ | 1,613 |  |  | $ | 2,897 |  |  | $ | 1,571 |  |  | $ | 2,855 |
Deferred revenue |  |  | 2,096 |  |  |  | 2,160 |  |  |  | 2,096 |  |  |  | 2,160 |
Employee benefits, including pension, postretirement and medical |  |  | 1,662 |  |  |  | 1,662 |  |  |  | 1,662 |  |  |  | 1,662 |
Alternative minimum tax (“AMT”) credit carryforwards |  |  | 116 |  |  |  | 232 |  |  |  | 116 |  |  |  | 232 |
Other |  |  | 523 |  |  |  | 566 |  |  |  | 522 |  |  |  | 566 |
Less: Valuation allowance |  |  | (68) |  |  |  | (48) |  |  |  | (68) |  |  |  | (48) |
Total deferred tax assets |  | $ | 5,942 |  |  | $ | 7,469 |  |  | $ | 5,899 |  |  | $ | 7,427 |
Depreciation |  | $ | (3,961) |  |  | $ | (3,921) |  |  | $ | (3,961) |  |  | $ | (3,921) |
Intangibles |  |  | (1,326) |  |  |  | (1,511) |  |  |  | (1,326) |  |  |  | (1,511) |
Total deferred tax liabilities |  | $ | (5,287) |  |  | $ | (5,432) |  |  | $ | (5,287) |  |  | $ | (5,432) |
Net deferred tax asset |  | $ | 655 |  |  | $ | 2,037 |  |  | $ | 612 |  |  | $ | 1,995 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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