Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Nonvested Restricted Stock Units Activity

The following table summarizes our restricted stock unit activity for the six months ended June 30, 2015 (in millions):

	Number of Units		Weighted Average Grant-Date Fair Value
Outstanding as of December 31, 2014	17.4		$	285
Units granted	7.2		380
Units vested	(2.8	)	243
Units forfeited	(1.4	)	298
Outstanding as of June 30, 2015	20.4		$	323

Nonvested Share Activity

Scheduled vesting for outstanding restricted stock units as of June 30, 2015, is as follows (in millions):

	Six Months Ended December 31,	Year Ended December 31,
	2015	2016	2017	2018	2019	Thereafter	Total
Scheduled vesting—restricted stock units	2.9	6.6	6.8	2.9	0.9	0.3	20.4