Components of Special Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Special Charges [Line Items]
Integration-related costs	$ 40	$ 50	$ 45	$ 70	$ 408	$ 60	$ 137	$ 134	$ 205	$ 739	$ 517
Labor agreement costs		127			21	454			127	475
Severance and benefits	91			14			76	49	105	125
Asset impairments	33				24			6	33	30	4
Termination of maintenance service contract									(5)		58
Additional costs associated with the temporarily grounded Boeing 787 aircraft			7	11					18
(Gains) losses on sale of assets and other special charges, net	1	34		(3)	(14)		(7)	(25)	32	(46)	13
Total									$ 520	$ 1,323	$ 592