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Income Tax Provision Differed from Amounts Computed at Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |  |  |
Income tax provision at statutory rate |  |  |  | $ 1,337 | $ 1,477 | $ 395
State income taxes, net of federal income tax |  |  |  | 38 | 38 | 10
Foreign income taxes |  |  |  | 3 | 4 | 2
Nondeductible employee meals |  |  |  | 16 | 15 | 15
Income tax adjustment | $ 180 | $ 88 | $ (3,218) | 180 | (3,130) |
State rate change |  |  |  | (12) |  |
Valuation allowance |  |  |  | 20 | (4,662) | (435)
Other, net |  |  |  | (26) | 7 | 9
Income tax expense (benefit) |  |  |  | 1,556 | (3,121) | (4)
United Airlines, Inc. |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax provision at statutory rate |  |  |  | 1,338 | 1,477 | 388
State income taxes, net of federal income tax |  |  |  | 38 | 38 | 10
Foreign income taxes |  |  |  | 3 | 4 | 2
Nondeductible employee meals |  |  |  | 16 | 15 | 15
Derivative market adjustment |  |  |  |  |  | (7)
Income tax adjustment |  |  |  | 180 |  |
State rate change |  |  |  | (12) |  |
Valuation allowance |  |  |  | 20 | (4,621) | (421)
Other, net |  |  |  | (25) | 7 | 9
Income tax expense (benefit) |  |  |  | $ 1,558 | $ (3,080) | $ (4)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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