Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011 Year	Dec. 31, 2010
Stockholders Equity Note [Line Items]
Convertible preferred stock, shares authorized	100,000,000	100,000,000
Convertible preferred stock, par value	$ 0.001	$ 0.001
Convertible preferred stock, shares issued
Convertible preferred stock, shares outstanding
Number of authorized classes of common stock	2
Common stock, shares authorized	9,000,000,000	9,000,000,000
Common stock, shares outstanding	324,895,000	321,301,000
Stock Plans, shares of common stock reserved for future issuance	21,794,492	27,329,837
Warrants held by selected financial institutions that were options purchased from employees under our Transferable Stock Option (TSO) program	1,200,000
Warrants held by selected financial institutions that were options purchased from employees under our Transferable Stock Option (TSO) program, weighted-average exercise price	$ 336.64
Warrants held by selected financial institutions that were options purchased from employees under our Transferable Stock Option (TSO) program, weighted-average remaining life (in years)	1.1
Class A Common Stock
Stockholders Equity Note [Line Items]
Common stock, shares authorized	6,000,000,000
Common stock, shares outstanding	257,552,401	250,413,000
Common stock, entitled votes per share	1
Class B Common Stock
Stockholders Equity Note [Line Items]
Common stock, shares authorized	3,000,000,000
Common stock, shares outstanding	67,342,362	70,888,000
Common stock, entitled votes per share	10
Employee stock options
Stockholders Equity Note [Line Items]
Unrecognized compensation cost	$ 583
Unrecognized compensation cost related to stock awards, weighted-average period (in years)	2.1
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Unrecognized compensation cost	$ 3,727
Unrecognized compensation cost related to stock awards, weighted-average period (in years)	2.9