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Schedule of Severance Related Accruals (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Severance and Benefits Costs
Schedule Of Accrual Activity [Line Items]
Beginning Balance	$ 14
Accrual	37
Payments	(23)
Ending Balance	28
Permanently Grounded Aircraft
Schedule Of Accrual Activity [Line Items]
Beginning Balance	41
Payments	(1)
Ending Balance	$ 40

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Schedule of Accrual Activity [Line Items]

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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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