Stockholders' Equity (Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Options Outstanding - Number of Shares
Balance as of December 31, 2013 (in shares)				10,065,726
Granted	0		0	0		3,142
Exercised				(1,607,444)
Forfeited/canceled				(216,263)
Balance as of June 30, 2014 (in shares)	8,242,019			8,242,019
Exercisable as of June 30, 2014 (in shares)	6,572,803			6,572,803
Vested and exercisable as of June 30, 2014 and expected to vest thereafter (in shares)	8,034,944	[1]		8,034,944	[1]
Options Outstanding - Weighted-Average Exercise Price
Balance as of December 31, 2013 (in dollars per share)				$ 215.50
Granted (in dollars per share)				$ 0.00
Exercised (in dollars per share)				$ 202.17
Forfeited/canceled (in dollars per share)				$ 320.65
Balance as of June 30, 2014 (in dollars per share)	$ 215.77			$ 215.77
Exercisable as of June 30, 2014 (in dollars per share)	$ 194.51			$ 194.51
Vested and exercisable as of June 30, 2014 and expected to vest thereafter (in dollars per share)	$ 213.63	[1]		$ 213.63	[1]
Options Outstanding - Weighted-Average Remaining Contractual Term
Balance as of June 30, 2014				4 years 10 months 24 days
Exercisable as of June 30, 2014				4 years 2 months 12 days
Exercisable as of June 30, 2014 and expected to vest thereafter				4 years 10 months 24 days	[1]
Options Outstanding - Aggregate Intrinsic Value
Balance as of June 30, 2014	$ 3,001	[2]		$ 3,001	[2]
Exercisable as of June 30, 2014	2,534	[2]		2,534	[2]
Exercisable as of June 30, 2014 and expected to vest thereafter	$ 2,944	[1],[2]		$ 2,944	[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 $584.67 and $575.28 for our Class A common stock and Class C capital stock, respectively, on June 30, 2014.