Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended					1 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012		Dec. 31, 2009 Nazomi Communications, Inc. Patent	Jul. 31, 2010 Positive Technologies, Inc. Patent	Jul. 31, 2011 GPNE Corp. Patent	Jul. 31, 2012 Technology Properties Limited, Phoenix Digital Solutions LLC and Patriot Scientific Corporation Patent	Jul. 31, 2012 Prejudgment Interest Technology Properties Limited, Phoenix Digital Solutions LLC and Patriot Scientific Corporation
Loss Contingencies [Line Items]
Rental expense under operating lease agreements	$ 197		$ 146	$ 545		$ 390
Tax contingencies	336			336			294
Pledged or otherwise restricted cash and marketable securities as collateral	290	[1]		290	[1]		99	[1]
Number of patents infringed									2	3	3	2
Plaintiff alleged damages to be paid												$ 42	$ 17

[1] We are required to pledge or otherwise restrict a portion of our cash, cash equivalents, and marketable securities as collateral for standby and trade letters of credit, guarantees, debt, and real estate lease agreements. We classify cash and marketable securities with use restrictions of less than twelve months as “Accounts receivable, net and other” and of twelve months or longer as non-current “Other assets” on our consolidated balance sheets. See “Note 3 — Commitments and Contingencies.”