Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Nonvested Restricted Stock Units Activity

The following table summarizes our restricted stock unit activity for the nine months ended September 30, 2013 (in millions):

	Number of Units		Weighted Average Grant-Date Fair Value
Outstanding as of December 31, 2012	15.4		$	184
Units granted	6.1		269
Units vested	(3.1	)	154
Units forfeited	(1.5	)	204
Outstanding as of September 30, 2013	16.9		$	218

Nonvested Share Activity

Scheduled vesting for outstanding restricted stock units as of September 30, 2013, is as follows (in millions):

	Three Months Ended December 31,	Year Ended December 31,
	2013	2014	2015	2016	2017	Thereafter	Total
Scheduled vesting—restricted stock units	1.5	5.4	5.6	2.9	1.2	0.3	16.9