Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Unrealized gains on available-for-sale securities, tax portion	$ (3)	$ 2	$ 1
Foreign currency translation adjustments, income (taxes)	6	13	(3)
Defined benefit plans, income tax benefit	(50)	33	25
Change in fair value of derivative instruments, income tax benefit	1	(55)	(114)
Defined benefit plans, Expense reclassified into operations from other comprehensive income, Income tax benefits	14	17	9
Change in fair value of derivative instruments, Expense reclassified into operations from other comprehensive income, Income tax benefits	$ 49	$ 44	$ 125