CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Total cash, cash equivalents, and marketable securities, securities loaned	$ 3,160,000,000	$ 2,778,000,000
Accounts receivable, allowance	581,000,000	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	12,000,000,000	9,000,000,000
Common stock, par value	330,000	325,000
Common stock, shares issued	329,979,000	324,895,000
Common stock, shares outstanding	329,979,000	324,895,000
Class A Common Stock
Class A and Class B common stock, par value per share	$ 0.001
Common stock, shares authorized	9,000,000,000	6,000,000,000
Common stock, par value	267,000	258,000
Common stock, shares issued	267,448,281	257,553,000
Common stock, shares outstanding	267,448,281	257,553,000
Class B Common Stock
Class A and Class B common stock, par value per share	$ 0.001
Common stock, shares authorized	3,000,000,000	3,000,000,000
Common stock, par value	$ 63,000	$ 67,000
Common stock, shares issued	62,530,474	67,342,000
Common stock, shares outstanding	62,530,474	67,342,000
Class C Capital Stock
Capital stock, par value per share	$ 0.001	$ 0.001
Capital stock, shares authorized	3,000,000,000	3,000,000,000
Capital stock, shares issued	0	0
Capital stock, shares outstanding	0	0