CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Accounts receivable, allowances for doubtful accounts	$ 22	$ 17
Stockholders' equity:
Common stock, par value	$ 0.000006	$ 0.000006
Convertible Preferred Stock
Stockholders' equity:
Convertible preferred stock, par value	$ 0.000006	$ 0.000006
Convertible preferred stock, shares authorized	0	569,000,000
Convertible preferred stock, shares issued	0	543,000,000
Convertible preferred stock, shares, outstanding	0	543,000,000
Class A Common Stock
Stockholders' equity:
Common stock, par value	$ 0.000006
Common stock, shares authorized	5,000,000,000	4,141,000,000
Common stock, shares, issued	1,671,277,621	117,000,000
Common stock, shares outstanding	1,671,277,621	117,000,000
Outstanding shares subject to repurchase	2,000,000	1,000,000
Class B Common Stock
Stockholders' equity:
Common stock, par value	$ 0.000006
Common stock, shares authorized	4,141,000,000	4,141,000,000
Common stock, shares, issued	701,427,574	1,213,000,000
Common stock, shares outstanding	701,427,574	1,213,000,000
Outstanding shares subject to repurchase	11,000,000	2,000,000