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Schedule of Severance Related Accrual (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Severance and Benefits Costs
Schedule Of Accrual Activity [Line Items]
Beginning Balance	$ 14	$ 27
Accrual	78	14
Payments	(65)	(11)
Ending Balance	27	30
Permanently Grounded Aircraft
Schedule Of Accrual Activity [Line Items]
Beginning Balance	41	78
Accrual		(17)
Payments	(12)	(20)
Ending Balance	$ 29	$ 41

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- Definition

Schedule of Accrual Activity [Line Items]

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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