Stockholders' Equity (Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Options Outstanding - Number of Shares
Balance at December 31, 2012 (in shares)	8,551,395
Granted (in shares)	1,571
Exercised (in shares)	(3,299,276)
Forfeited/canceled (in shares)	(220,827)
Balance at December 31, 2013 (in shares)	5,032,863
Exercisable as of December 31, 2013 (in shares)	3,795,911
Exercisable as of December 31, 2013 and expected to vest thereafter in (in shares)	4,880,718	[1]
Options Outstanding - Weighted-Average Exercise Price
Balance at December 31, 2012 (in dollars per share)	$ 405.98
Granted (in dollars per share)	$ 723.25
Exercised (in dollars per share)	$ 355.56
Forfeited/canceled (in dollars per share)	$ 595.92
Balance at December 31, 2013 (in dollars per share)	$ 431.00
Exercisable as of December 31, 2013 (in dollars per share)	$ 379.60
Exercisable as of December 31, 2013 and expected to vest thereafter (in dollars per share)	$ 426.33	[1]
Options Outstanding - Weighted-Average Remaining Contractual Term
Balance at December 31, 2013	5 years 0 months 12 days
Exercisable as of December 31, 2013	4 years 1 month 6 days
Exercisable as of December 31, 2013 and expected to vest thereafter	5 years 0 months 12 days	[1]
Options Outstanding - Average Intrinsic Value
Balance at December 31, 2013	$ 3,470	[2]
Exercisable as of December 31, 2013	2,813	[2]
Exercisable as of December 31, 2013 and expected to vest thereafter	$ 3,390	[1],[2]

[1] Options expected to vest reflect an estimated forfeiture rate.

[2] The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of $1,120.71 of our Class A common stock on December 31, 2013.