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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Provision Differed from Amounts Computed at Statutory Federal Income Tax Rate and was Composed of 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, as follows (in millions):

UAL		2017				2016				2015
Income tax provision at statutory rate		$	1,050			$	1,337			$	1,477
State income taxes, net of federal income tax benefit			29				38				38
Foreign tax rate differential			(43)				—				—
Foreign income taxes			3				3				4
Nondeductible employee meals			17				16				15
Impact of Tax Act			(192)				—				—
Income tax adjustment from AOCI			—				180				—
State rate change			12				(12)				—
Valuation allowance			(16)				20				(4,662)
Other, net			8				(26)				7
		$	868			$	1,556			$	(3,121)
Current		$	(77)			$	(92)			$	56
Deferred			945				1,648				(3,177)
		$	868			$	1,556			$	(3,121)
United		2017				2016				2015
Income tax provision at statutory rate		$	1,051			$	1,338			$	1,477
State income taxes, net of federal income tax			29				38				38
Foreign tax rate differential			(43)				—				—
Foreign income taxes			3				3				4
Nondeductible employee meals			17				16				15
Impact of Tax Act			(209)				—				—
Income tax adjustment from AOCI			—				180				—
State rate change			12				(12)				—
Valuation allowance			(16)				20				(4,621)
Other, net			8				(25)				7
		$	852			$	1,558			$	(3,080)
Current		$	(77)			$	(92)			$	56
Deferred			929				1,650				(3,136)
		$	852			$	1,558			$	(3,080)

Components of Deferred Tax Assets and Liabilities

Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows (in millions):

		UAL								United
		2017				2016				2017				2016
Deferred income tax asset (liability):
Federal and state net operating loss (“NOL”) carryforwards		$	601			$	1,613			$	574			$	1,571
Deferred revenue			1,069				2,096				1,069				2,096
Employee benefits, including pension, postretirement and medical			1,051				1,662				1,051				1,662
Alternative minimum tax credit carryforwards			—				116				—				116
Other			351				523				351				522
Less: Valuation allowance			(63)				(68)				(63)				(68)
Total deferred tax assets		$	3,009			$	5,942			$	2,982			$	5,899
Depreciation		$	(2,431)			$	(3,961)			$	(2,431)			$	(3,961)
Intangibles			(803)				(1,326)				(803)				(1,326)
Total deferred tax liabilities		$	(3,234)			$	(5,287)			$	(3,234)			$	(5,287)
Net deferred tax asset (liability)		$	(225)			$	655			$	(252)			$	612

X

- 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://www.xbrl.org/2003/role/presentationRef
-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

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X

- 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://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=84230637&loc=d3e32687-109319

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
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