CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Total cash equivalents and marketable securities, securities loaned	$ 4,219,000,000	$ 5,059,000,000
Accounts receivable, allowance	230,000,000	631,000,000
Convertible preferred stock, par value per share (in dollars 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
Common and Capital Stock, Par or Slated Value Per Share	$ 0.001	$ 0.001
Common and Capital Stock, Shares Authorized	15,000,000,000	15,000,000,000
Common and Capital Stock, Value, Issued	678,000	672,000
Common and Capital Stock, Shares, Issued	678,277,000	671,664,000
Common and Capital Stock, Shares, Outstanding	678,277,000	671,664,000
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, number of shares authorized	9,000,000,000	9,000,000,000
Common stock, par value	285,000	279,000
Common stock, shares issued	284,674,000	279,325,000
Common stock, shares outstanding	284,674,000	279,325,000
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, number of shares authorized	3,000,000,000	3,000,000,000
Common stock, par value	54,000	57,000
Common stock, shares issued	54,321,000	56,507,000
Common stock, shares outstanding	54,321,000	56,507,000
Class C Capital Stock
Capital stock, par value (in dollars per share)	$ 0.001	$ 0.001
Capital stock, number of shares authorized	3,000,000,000	3,000,000,000
Capital stock, value, issued	$ 339,000	$ 336,000
Capital stock, shares issued	339,282,000	335,832,000
Capital stock, shares outstanding	339,282,000	335,832,000