CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Total cash, cash equivalents, and marketable securities, securities loaned	$ 2,778,000,000	$ 4,031,000,000
Accounts receivable, allowance	133,000,000	101,000,000
Convertible preferred stock, par value per share	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	100,000,000	100,000,000
Convertible preferred stock, shares issued
Convertible preferred stock, shares outstanding
Class A and Class B common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	9,000,000,000	9,000,000,000
Common stock, par value	325,000	321,000
Common stock, shares issued	324,895,000	321,301,000
Common stock, shares outstanding	324,895,000	321,301,000
Class A Common Stock
Common stock, shares authorized	6,000,000,000
Common stock, par value	258,000	250,000
Common stock, shares issued	257,552,401	250,413,000
Common stock, shares outstanding	257,552,401	250,413,000
Class B Common Stock
Common stock, shares authorized	3,000,000,000
Common stock, par value	$ 67,000	$ 71,000
Common stock, shares issued	67,342,362	70,888,000
Common stock, shares outstanding	67,342,362	70,888,000