Details about Accumulated Other Comprehensive Income Components (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Salaries And Related Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of unrecognized (gains) losses and prior service cost (credit)	$ (18)	[1],[2]	$ 17	[1],[2]	$ (34)	[1],[2]	$ 38	[1],[2]
Miscellaneous, Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Available for sale securities-reclassifications of gains into earnings	(6)	[1]			(6)	[1]
Fuel Oil Contract | Cash Flow Hedging | Aircraft Fuel
Accumulated Other Comprehensive Income (Loss) [Line Items]
Fuel contracts-reclassifications of losses into earnings	$ 1	[1]	$ 9	[1]	$ 4	[1]	$ 18	[1]

[1] Income tax expense for these items was offset by the Company's valuation allowance.

[2] This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 5 of this report for additional details).