Components of Special Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Special Charges [Line Items]
Merger integration-related costs	$ 45	$ 137	$ 115	$ 271
Additional costs associated with the temporarily grounded Boeing 787 aircraft	7		18
Voluntary severance and benefits		76	14	125
Gains on sale of assets and other special items, net		(7)	(3)	(26)
Subtotal special charges	52	206	144	370
Income tax benefit				(2)
Total special charges, net of income taxes	$ 52	$ 206	$ 144	$ 368