Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes the activities for our stock options for the three months ended March 31, 2015:

	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in millions) (1)
	(unaudited)
Balance as of December 31, 2014	7,240,419		$	215.56
Granted	0		N/A
Exercised	(619,179	)	$	179.33
Forfeited/canceled	(4,153	)	$	312.03
Balance as of March 31, 2015	6,617,087		$	218.88	4.2	$	2,200
Exercisable as of March 31, 2015	5,681,295		$	203.22	3.8	$	1,978
Exercisable as of March 31, 2015 and expected to vest thereafter (2)	5,901,780		$	217.40	4.2	$	2,176

⁽¹⁾  The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of $554.70 and $548.00 for our Class A common stock and Class C capital stock, respectively, on March 31, 2015.

⁽²⁾  Options expected to vest reflect an estimated forfeiture rate.

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table summarizes the activities for our unvested restricted stock units (RSUs) for the three months ended March 31, 2015:

	Unvested Restricted Stock Units
	Number of Shares		Weighted- Average Grant-Date Fair Value
	(unaudited)
Unvested as of December 31, 2014	24,619,549		$	487.80
Granted	1,233,138		$	527.84
Vested	(2,617,997	)	$	434.04
Forfeited/canceled	(378,918	)	$	479.95
Unvested as of March 31, 2015	22,855,772		$	496.25
Expected to vest after March 31, 2015 (1)	20,385,063		$	496.25

⁽¹⁾  RSUs expected to vest reflect an estimated forfeiture rate.