Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Nonvested Restricted Stock Units Activity

The following table summarizes our restricted stock unit activity for the three months ended March 31, 2016 (in millions):

	Number of Units		Weighted-Average Grant-Date Fair Value
Outstanding as of December 31, 2015	18.9		$	362
Units granted	0.9		566
Units vested	(1.0	)	271
Units forfeited	(0.6	)	374
Outstanding as of March 31, 2016	18.2		$	377

Nonvested Share Activity

Scheduled vesting for outstanding restricted stock units as of March 31, 2016, is as follows (in millions):

	Nine Months Ended December 31,	Year Ended December 31,
	2016	2017	2018	2019	2020	Thereafter	Total
Scheduled vesting—restricted stock units	5.3	6.8	3.8	1.9	0.2	0.2	18.2