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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Components of Deferred Tax Assets and Liabilities | The components of deferred tax assets and liabilities at December 31, 2021 and 2020, are as follows:
(in millions) |  | 2021 |  | 2020
DEFERRED TAX LIABILITIES: |  |  |  |
Accelerated depreciation |  | $ | 2,883 |  |  | $ | 2,939 |
Prepaid insurance |  | 189 |  |  | 190 |
Operating lease right-of-use assets |  | 356 |  |  | 423 |
Other |  | 188 |  |  | 67 |
Total deferred tax liabilities |  | 3,616 |  |  | 3,619 |
DEFERRED TAX ASSETS: |  |  |  |
Accrued employee benefits |  | 341 |  |  | 491 |
Rapid rewards loyalty liability |  | 636 |  |  | 632 |
Operating lease liabilities |  | 371 |  |  | 443 |
Customer travel credits |  | 305 |  |  | 117 |
Construction obligation |  | — |  |  | 72 |
Net operating losses and tax credits |  | 36 |  | (a) | 60 |
Other |  | 157 |  |  | 170 |
Total deferred tax assets |  | 1,846 |  |  | 1,985 |
Net deferred tax liability |  | $ | 1,770 |  |  | $ | 1,634 |
(a) At December 31, 2021 and 2020, the Company had approximately $44 million and $65 million, respectively, of state net operating loss carryforwards (tax effected) to reduce future state taxable income. These state net operating loss carryforwards will expire in years 2025 - 2040 if unused.
Components of the Income Tax Provision | The provision (benefit) for income taxes is composed of the following:
(in millions) |  | 2021 |  | 2020 |  | 2019
CURRENT: |  |  |  |  |  |
Federal (a) |  | $ | 337 |  |  | $ | (273) |  |  | $ | 610 |
State |  | 33 |  |  | (5) |  |  | 102 |
Change in federal statutory rate (b) |  | (2) |  |  | (188) |  |  | — |
Total current |  | 368 |  |  | (466) |  |  | 712 |
DEFERRED: |  |  |  |  |  |
Federal (a) |  | (43) |  |  | (589) |  |  | (18) |
State |  | 2 |  |  | (76) |  |  | (6) |
State net operating losses |  | 21 |  |  | (51) |  |  | — |
Change in federal statutory tax rate (c) |  | — |  |  | — |  |  | (31) |
Total deferred |  | (20) |  |  | (716) |  |  | (55) |
|  | $ | 348 |  |  | $ | (1,182) |  |  | $ | 657 |
(a) The CARES Act allows entities to carry back 2020 losses to prior periods of up to five years, and claim refunds of federal taxes paid. The Company has filed the refund claim with the IRS, and expects a refund of $472 million in the first six months of 2022. (b) The benefit is representative of the excess refund generated as the result of carrying the 2020 losses back to a period when the federal statutory tax rate was 35 percent as opposed to the current tax rate of 21 percent. (c) The Tax Cuts and Jobs Act was enacted in December 2017, which reduced the U.S. federal corporate tax rate from the previous rate of 35 percent to 21 percent.
Income Tax Provision Reconciliation To Federal Income Tax Statutory Rate | The effective tax rate on Income (loss) before income taxes differed from the federal income tax statutory rate for the following reasons:
(in millions) |  | 2021 |  | 2020 |  | 2019 |
Tax at statutory U.S. tax rates |  | $ | 278 |  |  | $ | (894) |  |  | $ | 621 |  |
State income taxes, net of federal benefit |  | 45 |  |  | (115) |  |  | 76 |  |
Change in federal statutory tax rate |  | (2) |  |  | (188) |  | (a) | (31) |  | (b)
Other, net |  | 27 |  |  | 15 |  |  | (9) |  |
Total income tax provision (benefit) |  | $ | 348 |  |  | $ | (1,182) |  |  | $ | 657 |  |
(a) The benefit is representative of the excess refund generated as the result of carrying the 2020 losses back to a period when the federal statutory tax rate was 35 percent as opposed to the current tax rate of 21 percent. (b) The Tax Cuts and Jobs Act was enacted in December 2017, which reduced the U.S. federal corporate tax rate from the previous rate of 35 percent to 21 percent.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121826272&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://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=121826272&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=121826272&loc=d3e32687-109319 + Details
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