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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income Tax Provision (Benefit) Differed from Amounts Computed at the Statutory Federal Income Tax Rate and 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 |  | 2018 |  | 2017 (a) |  | 2016 (a)
Income tax provision at statutory rate |  | $ | 558 |  |  | $ | 1,064 |  |  | $ | 1,320 |
State income taxes, net of federal income tax benefit |  | 29 |  |  | 30 |  |  | 38 |
Foreign tax rate differential |  | (84 | ) |  | (43 | ) |  | — |
Global intangible low-taxed income |  | 4 |  |  | — |  |  | — |
Foreign income taxes |  | 2 |  |  | 3 |  |  | 3 |
Nondeductible employee meals |  | 12 |  |  | 17 |  |  | 16 |
Impact of Tax Act |  | (5 | ) |  | (179 | ) |  | — |
Income tax adjustment from AOCI (b) |  | — |  |  | — |  |  | 180 |
State rate change |  | 3 |  |  | 12 |  |  | (12 | )
Valuation allowance |  | (3 | ) |  | (16 | ) |  | 20 |
Other, net |  | 13 |  |  | 8 |  |  | (26 | )
|  | $ | 529 |  |  | $ | 896 |  |  | $ | 1,539 |
Current |  | $ | 14 |  |  | $ | (77 | ) |  | $ | (92 | )
Deferred |  | 515 |  |  | 973 |  |  | 1,631 |
|  | $ | 529 |  |  | $ | 896 |  |  | $ | 1,539 |
United |  | 2018 |  | 2017 (a) |  | 2016 (a)
Income tax provision at statutory rate |  | $ | 559 |  |  | $ | 1,065 |  |  | $ | 1,321 |
State income taxes, net of federal income tax |  | 29 |  |  | 30 |  |  | 38 |
Foreign tax rate differential |  | (84 | ) |  | (43 | ) |  | — |
Global intangible low-taxed income |  | 4 |  |  | — |  |  | — |
Foreign income taxes |  | 2 |  |  | 3 |  |  | 3 |
Nondeductible employee meals |  | 12 |  |  | 17 |  |  | 16 |
Impact of Tax Act |  | (5 | ) |  | (196 | ) |  | — |
Income tax adjustment from AOCI (b) |  | — |  |  | — |  |  | 180 |
State rate change |  | 3 |  |  | 12 |  |  | (12 | )
Valuation allowance |  | (3 | ) |  | (16 | ) |  | 20 |
Other, net |  | 12 |  |  | 7 |  |  | (25 | )
|  | $ | 529 |  |  | $ | 879 |  |  | $ | 1,541 |
Current |  | $ | 14 |  |  | $ | (77 | ) |  | $ | (92 | )
Deferred |  | 515 |  |  | 956 |  |  | 1,633 |
|  | $ | 529 |  |  | $ | 879 |  |  | $ | 1,541 |
(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information. (b) Prior to the release of the deferred income tax valuation allowance in the third quarter of 2015, the Company recorded approximately $465 million of valuation allowance adjustments in AOCI. Subsequent to the release of the deferred income tax valuation allowance in 2015, the $465 million debit remained within AOCI, of which $180 million related to losses on fuel hedges designated for hedge accounting and $285 million related to pension and other postretirement liabilities. Accounting rules required the adjustments to remain in AOCI as long as the Company had fuel derivatives designated for cash flow hedge accounting and the Company continues to provide pension and postretirement benefits. In 2016, the Company settled all of its fuel hedges and has not entered into any new fuel derivative contracts for hedge accounting. Accordingly, the Company reclassified the $180 million to income tax expense in 2016.
Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities | Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows (in millions):
|  | UAL |  | United
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Deferred income tax asset (liability): |  |  |  |  |  |  |  |
Federal and state net operating loss ("NOL") carryforwards |  | $ | 398 |  |  | $ | 601 |  |  | $ | 372 |  |  | $ | 574 |
Deferred revenue |  | 1,232 |  |  | 1,090 |  |  | 1,232 |  |  | 1,090 |
Employee benefits, including pension, postretirement and medical |  | 885 |  |  | 1,051 |  |  | 885 |  |  | 1,051 |
Other |  | 408 |  |  | 351 |  |  | 406 |  |  | 351 |
Less: Valuation allowance |  | (59 | ) |  | (63 | ) |  | (59 | ) |  | (63 | )
Total deferred tax assets |  | $ | 2,864 |  |  | $ | 3,030 |  |  | $ | 2,836 |  |  | $ | 3,003 |
Depreciation |  | $ | (2,929 | ) |  | $ | (2,431 | ) |  | $ | (2,929 | ) |  | $ | (2,431 | )
Intangibles |  | (749 | ) |  | (803 | ) |  | (749 | ) |  | (803 | )
Total deferred tax liabilities |  | $ | (3,678 | ) |  | $ | (3,234 | ) |  | $ | (3,678 | ) |  | $ | (3,234 | )
Net deferred tax liability |  | $ | (814 | ) |  | $ | (204 | ) |  | $ | (842 | ) |  | $ | (231 | )

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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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