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v3.19.3.a.u2

Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 35.00%
DEFERRED TAX LIABILITIES: |  |  |  |
Accelerated depreciation |  | $ 3,096 | $ 3,395 |
Operating lease right-of-use assets |  | 293 |  |
Other |  | 93 | 92 |
Deferred Tax Liabilities, Gross |  | 3,482 | 3,487 |
DEFERRED TAX ASSETS: |  |  |  |
Deferred tax assets construction obligation |  | 38 | 355 |
Accrued employee benefits |  | 346 | 329 |
Rapid rewards loyalty liability |  | 305 | 267 |
Operating lease liabilities |  | 308 |  |
Other |  | 121 | 109 |
Total deferred tax assets |  | 1,118 | 1,060 |
Total deferred tax liabilities |  | 2,364 | 2,427 |
CURRENT: |  |  |  |
Federal |  | 610 | 338 | $ 904
State |  | 102 | 60 | 72
Total current |  | 712 | 398 | 976
DEFERRED: |  |  |  |
Federal |  | (18) | 299 | 200
State |  | (6) | 2 | 2
Change in federal statutory rate | [1] | (31) | 0 | (1,270)
Total deferred |  | (55) | 301 | (1,068)
Total |  | 657 | 699 | (92)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |
Tax at statutory U.S. tax rates |  | 621 | 664 | 1,143
State income taxes, net of federal benefit |  | 76 | 49 | 50
Change in federal statutory rate | [1] | (31) | 0 | (1,270)
Other, net |  | $ (9) | $ (14) | $ (15)
[1] | 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 Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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