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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
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 (in millions):
UAL |  | 2020 |  | 2019 |  | 2018
Income tax provision (benefit) at statutory rate |  | $ | (1,852) |  |  | $ | 822 |  |  | $ | 556 |
State income taxes, net of federal income tax benefit |  | (110) |  |  | 50 |  |  | 29 |
Foreign tax rate differential |  | — |  |  | (90) |  |  | (84) |
Global intangible low-taxed income |  | — |  |  | 90 |  |  | 4 |
Foreign income taxes |  | 1 |  |  | 1 |  |  | 2 |
Nondeductible employee meals |  | 5 |  |  | 12 |  |  | 12 |
State rate change |  | (2) |  |  | — |  |  | 3 |
Valuation allowance |  | 197 |  |  | (4) |  |  | (3) |
Other, net |  | 8 |  |  | 24 |  |  | 7 |
|  | $ | (1,753) |  |  | $ | 905 |  |  | $ | 526 |
Current |  | $ | (12) |  |  | $ | 23 |  |  | $ | 14 |
Deferred |  | (1,741) |  |  | 882 |  |  | 512 |
|  | $ | (1,753) |  |  | $ | 905 |  |  | $ | 526 |
United |  | 2020 |  | 2019 |  | 2018
Income tax provision (benefit) at statutory rate |  | $ | (1,852) |  |  | $ | 822 |  |  | $ | 557 |
State income taxes, net of federal income tax |  | (110) |  |  | 50 |  |  | 29 |
Foreign tax rate differential |  | — |  |  | (90) |  |  | (84) |
Global intangible low-taxed income |  | — |  |  | 90 |  |  | 4 |
Foreign income taxes |  | 1 |  |  | 1 |  |  | 2 |
Nondeductible employee meals |  | 5 |  |  | 12 |  |  | 12 |
State rate change |  | (2) |  |  | — |  |  | 3 |
Valuation allowance |  | 197 |  |  | (4) |  |  | (3) |
Other, net |  | 8 |  |  | 24 |  |  | 7 |
|  | $ | (1,753) |  |  | $ | 905 |  |  | $ | 527 |
Current |  | $ | (12) |  |  | $ | 23 |  |  | $ | 14 |
Deferred |  | (1,741) |  |  | 882 |  |  | 513 |
|  | $ | (1,753) |  |  | $ | 905 |  |  | $ | 527 |
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, 2020 and 2019 were as follows (in millions):
|  | UAL |  | United
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Deferred income tax asset (liability): |  |  |  |  |  |  |  |
Federal and state net operating loss ("NOL") carryforwards |  | $ | 2,476 |  |  | $ | 695 |  |  | $ | 2,448 |  |  | $ | 668 |
Deferred revenue |  | 1,409 |  |  | 1,287 |  |  | 1,409 |  |  | 1,287 |
Employee benefits, including pension, postretirement and medical |  | 1,103 |  |  | 715 |  |  | 1,103 |  |  | 715 |
Operating lease liabilities |  | 1,247 |  |  | 1,256 |  |  | 1,247 |  |  | 1,256 |
Sale leaseback liabilities |  | 260 |  |  | — |  |  | 260 |  |  | — |
Other |  | 362 |  |  | 165 |  |  | 362 |  |  | 165 |
Less: Valuation allowance |  | (247) |  |  | (58) |  |  | (247) |  |  | (58) |
Total deferred tax assets |  | $ | 6,610 |  |  | $ | 4,060 |  |  | $ | 6,582 |  |  | $ | 4,033 |
Depreciation |  | $ | (4,789) |  |  | $ | (4,011) |  |  | $ | (4,789) |  |  | $ | (4,011) |
Operating lease right-of-use asset |  | (1,028) |  |  | (1,061) |  |  | (1,028) |  |  | (1,061) |
Intangibles |  | (662) |  |  | (724) |  |  | (662) |  |  | (724) |
Total deferred tax liabilities |  | $ | (6,479) |  |  | $ | (5,796) |  |  | $ | (6,479) |  |  | $ | (5,796) |
Net deferred tax asset (liability) |  | $ | 131 |  |  | $ | (1,736) |  |  | $ | 103 |  |  | $ | (1,763) |

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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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- 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://fasb.org/us-gaap/role/ref/legacyRef -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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