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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
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 |  | 2019 |  | 2018 (a) |  | 2017 (a)
Income tax provision at statutory rate |  | $ | 822 |  |  | $ | 556 |  |  | $ | 1,058 |
State income taxes, net of federal income tax benefit |  | 50 |  |  | 29 |  |  | 30 |
Foreign tax rate differential |  | (90 | ) |  | (84 | ) |  | (43 | )
Global intangible low-taxed income |  | 90 |  |  | 4 |  |  | — |
Foreign income taxes |  | 1 |  |  | 2 |  |  | 3 |
Nondeductible employee meals |  | 12 |  |  | 12 |  |  | 17 |
Impact of Tax Act |  | — |  |  | (5 | ) |  | (189 | )
State rate change |  | — |  |  | 3 |  |  | 12 |
Valuation allowance |  | (4 | ) |  | (3 | ) |  | (16 | )
Other, net |  | 24 |  |  | 12 |  |  | 8 |
|  | $ | 905 |  |  | $ | 526 |  |  | $ | 880 |
Current |  | $ | 23 |  |  | $ | 14 |  |  | $ | (77 | )
Deferred |  | 882 |  |  | 512 |  |  | 957 |
|  | $ | 905 |  |  | $ | 526 |  |  | $ | 880 |
United |  | 2019 |  | 2018 (a) |  | 2017 (a)
Income tax provision at statutory rate |  | $ | 822 |  |  | $ | 557 |  |  | $ | 1,059 |
State income taxes, net of federal income tax |  | 50 |  |  | 29 |  |  | 30 |
Foreign tax rate differential |  | (90 | ) |  | (84 | ) |  | (43 | )
Global intangible low-taxed income |  | 90 |  |  | 4 |  |  | — |
Foreign income taxes |  | 1 |  |  | 2 |  |  | 3 |
Nondeductible employee meals |  | 12 |  |  | 12 |  |  | 17 |
Impact of Tax Act |  | — |  |  | (5 | ) |  | (206 | )
State rate change |  | — |  |  | 3 |  |  | 12 |
Valuation allowance |  | (4 | ) |  | (3 | ) |  | (16 | )
Other, net |  | 24 |  |  | 12 |  |  | 8 |
|  | $ | 905 |  |  | $ | 527 |  |  | $ | 864 |
Current |  | $ | 23 |  |  | $ | 14 |  |  | $ | (77 | )
Deferred |  | 882 |  |  | 513 |  |  | 941 |
|  | $ | 905 |  |  | $ | 527 |  |  | $ | 864 |
(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 of this report for additional information on the adjustments.
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, 2019 and 2018 were as follows (in millions):
|  | UAL |  | United
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Deferred income tax asset (liability): |  |  |  |  |  |  |  |
Federal and state net operating loss ("NOL") carryforwards |  | $ | 695 |  |  | $ | 398 |  |  | $ | 668 |  |  | $ | 371 |
Deferred revenue |  | 1,287 |  |  | 1,232 |  |  | 1,287 |  |  | 1,232 |
Employee benefits, including pension, postretirement and medical |  | 715 |  |  | 885 |  |  | 715 |  |  | 885 |
Operating lease liabilities |  | 1,256 |  |  | 1,338 |  |  | 1,256 |  |  | 1,338 |
Other |  | 165 |  |  | 229 |  |  | 165 |  |  | 229 |
Less: Valuation allowance |  | (58 | ) |  | (59 | ) |  | (58 | ) |  | (59 | )
Total deferred tax assets |  | $ | 4,060 |  |  | $ | 4,023 |  |  | $ | 4,033 |  |  | $ | 3,996 |
Depreciation |  | $ | (4,011 | ) |  | $ | (2,929 | ) |  | $ | (4,011 | ) |  | $ | (2,929 | )
Operating lease right-of-use asset |  | (1,061 | ) |  | (1,173 | ) |  | (1,061 | ) |  | (1,173 | )
Intangibles |  | (724 | ) |  | (749 | ) |  | (724 | ) |  | (749 | )
Total deferred tax liabilities |  | $ | (5,796 | ) |  | $ | (4,851 | ) |  | $ | (5,796 | ) |  | $ | (4,851 | )
Net deferred tax liability |  | $ | (1,736 | ) |  | $ | (828 | ) |  | $ | (1,763 | ) |  | $ | (855 | )

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