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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of provision for income taxes | Our income tax expense (benefit) consisted of the following for the years ended December 31 (in millions):
|  | 2020 |  | 2019 |  | 2018
Deferred: |  |  |  |  |  |
Federal |  | $ | (247) |  |  | $ | 119 |  |  | $ | 82 |
State |  | (82) |  |  | 20 |  |  | 7 |
Foreign |  | — |  |  | — |  |  | 1 |
Deferred income tax (benefit) expense |  | (329) |  |  | 139 |  |  | 90 |
Current: |  |  |  |  |  |
Federal |  | (199) |  |  | 36 |  |  | (61) |
State |  | (9) |  |  | 19 |  |  | (5) |
Foreign |  | (2) |  |  | 5 |  |  | 6 |
Current income tax (benefit) expense |  | (210) |  |  | 60 |  |  | (60) |
Total income tax (benefit) expense |  | $ | (539) |  |  | $ | 199 |  |  | $ | 30 |
Schedule of income taxes differed from the federal income tax statutory rate | The effective tax rate on income before income taxes differed from the federal income tax statutory rate for the years ended December 31 for the following reasons (in millions):
|  | 2020 |  | 2019 |  | 2018
Income tax (benefit) expense at statutory rate |  | $ | (398) |  |  | $ | 161 |  |  | $ | 45 |
State income tax, net of federal benefit |  | (71) |  |  | 31 |  |  | 8 |
Adjustment of net deferred tax liability from enacted tax rate change |  | — |  |  | — |  |  | (28) |
Nondeductible expenses |  | 5 |  |  | 8 |  |  | 5 |
Net operating loss carryback |  | (73) |  |  | — |  |  | — |
Foreign tax credit re-characterization |  | (13) |  |  | — |  |  | — |
Foreign rate differential |  | 2 |  |  | (3) |  |  | (2) |
Valuation allowance |  | 10 |  |  | — |  |  | — |
Unrecognized tax benefit |  | (3) |  |  | — |  |  | — |
Other, net |  | 2 |  |  | 2 |  |  | 2 |
Total income tax (benefit) expense |  | $ | (539) |  |  | $ | 199 |  |  | $ | 30 |
Schedule of deferred tax assets and deferred liabilities | The components of our deferred tax assets and liabilities as of December 31 are as follows (in millions):
|  | 2020 |  | 2019
Deferred tax assets: |  |  |  |
Deferred revenue/gains |  | $ | 161 |  |  | $ | 127 |
Employee benefits |  | 71 |  |  | 47 |
Foreign tax credit |  | 81 |  |  | 42 |
Net operating loss carryforward |  | 335 |  |  | 31 |
Operating lease liabilities |  | 204 |  |  | 212 |
Rent expense |  | 33 |  |  | 17 |
Total deferred tax assets |  | 885 |  |  | 476 |
Valuation allowance |  | (69) |  |  | (31) |
Deferred tax assets, net |  | 816 |  |  | 445 |
Deferred tax liabilities: |  |  |  |
Accelerated depreciation |  | (1,538) |  |  | (1,423) |
Operating lease assets |  | (197) |  |  | (236) |
Other |  | (3) |  |  | (37) |
Total deferred tax liabilities |  | (1,738) |  |  | (1,696) |
Net deferred tax liability |  | $ | (922) |  |  | $ | (1,251) |
Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
|  | 2020 |  | 2019 |  | 2018
Unrecognized tax benefits at January 1, |  | $ | 36 |  |  | $ | 33 |  |  | $ | 31 |
Increases for tax positions taken during the period |  | 1 |  |  | 6 |  |  | 5 |
Decreases for tax positions taken during a prior period |  | (5) |  |  | (3) |  |  | (3) |
Unrecognized tax benefits December 31, |  | $ | 32 |  |  | $ | 36 |  |  | $ | 33 |

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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=84230637&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=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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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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