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Components of Special Charges (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating:
Severance and benefit costs	$ 41	$ 6	$ 78	$ 14
Impairment of assets		412		412
Labor agreement costs		10		110
Cleveland airport lease restructuring				74
(Gains) losses on sale of assets and other special charges	3	6	17	14
Special charges	44	434	95	624
Nonoperating:
Other (gain) loss		(9)		(1)
Special charges before income taxes	44	425	95	623
Income tax benefit related to special charges	(16)	(153)	(34)	(225)
Total special charges, net of tax	$ 28	$ 272	$ 61	$ 398

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Income Tax Expense (Benefit), Restructuring

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Bonus payments made to employees in conjunction with the ratification of employment contracts.

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Special items before income taxes.

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Total special items in the period.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of gain (loss) on sale or disposal of other assets.

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Amount of gain (loss) related to nonoperating activities, classified as other.

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Period expense related to postemployment benefits.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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