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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Provision Differed from Amounts Computed at Statutory Federal Income Tax Rate and was Composed of Significant Components | The income tax provision (benefit) differed from amounts computed at the statutory federal income tax rate and consisted of the following significant components, as follows (in millions):
UAL |  | 2017 |  |  | 2016 |  |  | 2015 |
Income tax provision at statutory rate |  | $ | 1,050 |  |  | $ | 1,337 |  |  | $ | 1,477 |
State income taxes, net of federal income tax benefit |  |  | 29 |  |  |  | 38 |  |  |  | 38 |
Foreign tax rate differential |  |  | (43) |  |  |  | — |  |  |  | — |
Foreign income taxes |  |  | 3 |  |  |  | 3 |  |  |  | 4 |
Nondeductible employee meals |  |  | 17 |  |  |  | 16 |  |  |  | 15 |
Impact of Tax Act |  |  | (192) |  |  |  | — |  |  |  | — |
Income tax adjustment from AOCI |  |  | — |  |  |  | 180 |  |  |  | — |
State rate change |  |  | 12 |  |  |  | (12) |  |  |  | — |
Valuation allowance |  |  | (16) |  |  |  | 20 |  |  |  | (4,662) |
Other, net |  |  | 8 |  |  |  | (26) |  |  |  | 7 |
|  | $ | 868 |  |  | $ | 1,556 |  |  | $ | (3,121) |
Current |  | $ | (77) |  |  | $ | (92) |  |  | $ | 56 |
Deferred |  |  | 945 |  |  |  | 1,648 |  |  |  | (3,177) |
|  | $ | 868 |  |  | $ | 1,556 |  |  | $ | (3,121) |
United |  | 2017 |  |  | 2016 |  |  | 2015 |
Income tax provision at statutory rate |  | $ | 1,051 |  |  | $ | 1,338 |  |  | $ | 1,477 |
State income taxes, net of federal income tax |  |  | 29 |  |  |  | 38 |  |  |  | 38 |
Foreign tax rate differential |  |  | (43) |  |  |  | — |  |  |  | — |
Foreign income taxes |  |  | 3 |  |  |  | 3 |  |  |  | 4 |
Nondeductible employee meals |  |  | 17 |  |  |  | 16 |  |  |  | 15 |
Impact of Tax Act |  |  | (209) |  |  |  | — |  |  |  | — |
Income tax adjustment from AOCI |  |  | — |  |  |  | 180 |  |  |  | — |
State rate change |  |  | 12 |  |  |  | (12) |  |  |  | — |
Valuation allowance |  |  | (16) |  |  |  | 20 |  |  |  | (4,621) |
Other, net |  |  | 8 |  |  |  | (25) |  |  |  | 7 |
|  | $ | 852 |  |  | $ | 1,558 |  |  | $ | (3,080) |
Current |  | $ | (77) |  |  | $ | (92) |  |  | $ | 56 |
Deferred |  |  | 929 |  |  |  | 1,650 |  |  |  | (3,136) |
|  | $ | 852 |  |  | $ | 1,558 |  |  | $ | (3,080) |
Components of Deferred Tax Assets and Liabilities | Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows (in millions):
|  | UAL |  |  | United |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Deferred income tax asset (liability): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal and state net operating loss (“NOL”) carryforwards |  | $ | 601 |  |  | $ | 1,613 |  |  | $ | 574 |  |  | $ | 1,571 |
Deferred revenue |  |  | 1,069 |  |  |  | 2,096 |  |  |  | 1,069 |  |  |  | 2,096 |
Employee benefits, including pension, postretirement and medical |  |  | 1,051 |  |  |  | 1,662 |  |  |  | 1,051 |  |  |  | 1,662 |
Alternative minimum tax credit carryforwards |  |  | — |  |  |  | 116 |  |  |  | — |  |  |  | 116 |
Other |  |  | 351 |  |  |  | 523 |  |  |  | 351 |  |  |  | 522 |
Less: Valuation allowance |  |  | (63) |  |  |  | (68) |  |  |  | (63) |  |  |  | (68) |
Total deferred tax assets |  | $ | 3,009 |  |  | $ | 5,942 |  |  | $ | 2,982 |  |  | $ | 5,899 |
Depreciation |  | $ | (2,431) |  |  | $ | (3,961) |  |  | $ | (2,431) |  |  | $ | (3,961) |
Intangibles |  |  | (803) |  |  |  | (1,326) |  |  |  | (803) |  |  |  | (1,326) |
Total deferred tax liabilities |  | $ | (3,234) |  |  | $ | (5,287) |  |  | $ | (3,234) |  |  | $ | (5,287) |
Net deferred tax asset (liability) |  | $ | (225) |  |  | $ | 655 |  |  | $ | (252) |  |  | $ | 612 |

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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=84230637&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=84230637&loc=d3e32687-109319 + Details
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