CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions, except Share data in Thousands	Total	Class A and Class B Common Stock and Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings
Beginning Balance at Dec. 31, 2008	$ 28,239	$ 14,450	$ 227	$ 13,562
Beginning Balance (in shares) at Dec. 31, 2008		315,114
Common stock issued (in shares)		2,658
Common stock issued	350	350	0	0
Stock-based compensation expense	1,164	1,164	0	0
Stock-based compensation tax benefits	60	60	0	0
Tax withholding related to vesting of restricted stock units	(207)	(207)	0	0
Net income	6,520	0	0	6,520
Other comprehensive income (loss)	(122)	0	(122)	0
Ending Balance at Dec. 31, 2009	36,004	15,817	105	20,082
Ending Balance (in shares) at Dec. 31, 2009		317,772
Common stock issued (in shares)		5,126
Common stock issued	1,412	1,412	0	0
Common stock repurchased (shares)		(1,597)
Common stock repurchased	(801)	(82)	0	(719)
Stock-based compensation expense	1,376	1,376	0	0
Stock-based compensation tax benefits	72	72	0	0
Tax withholding related to vesting of restricted stock units	(360)	(360)	0	0
Net income	8,505	0	0	8,505
Other comprehensive income (loss)	33	0	33	0
Ending Balance at Dec. 31, 2010	46,241	18,235	138	27,868
Ending Balance (in shares) at Dec. 31, 2010		321,301
Common stock issued (in shares)		3,594
Common stock issued	621	621	0	0
Stock-based compensation expense	1,974	1,974	0	0
Stock-based compensation tax benefits	60	60	0	0
Tax withholding related to vesting of restricted stock units	(626)	(626)	0	0
Net income	9,737	0	0	9,737
Other comprehensive income (loss)	138	0	138	0
Ending Balance at Dec. 31, 2011	$ 58,145	$ 20,264	$ 276	$ 37,605
Ending Balance (in shares) at Dec. 31, 2011		324,895