CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Total cash, cash equivalents, and marketable securities, securities loaned	$ 2,869,000,000	$ 2,778,000,000
Accounts receivable, allowance	147,000,000	133,000,000
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	0	0
Convertible preferred stock, shares outstanding	0	0
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	326,000	325,000
Common stock, shares issued	325,906,000	324,895,000
Common stock, shares outstanding	325,906,000	324,895,000
Class A Common Stock
Common stock, par value	260,000	258,000
Common stock, shares issued	259,502,000	257,553,000
Common stock, shares outstanding	259,502,000	257,553,000
Class B Common Stock
Common stock, par value	$ 66,000	$ 67,000
Common stock, shares issued	66,404,000	67,342,000
Common stock, shares outstanding	66,404,000	67,342,000