Stock-Based Plans (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option activity

The following table summarizes stock option activity for the six months ended June 30, 2015:  

	Options
	(In millions)
Outstanding as of January 1, 2015	10
Granted and assumed	2
Exercised	(3	)
Forfeited/expired/canceled	—
Outstanding as of June 30, 2015	9

Schedule of restricted stock unit activity

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

	Units
	(In millions)
Outstanding as of January 1, 2015	36
Awarded and assumed	16
Vested	(10	)
Forfeited	(4	)
Outstanding as of June 30, 2015	38

Schedule of stock-based compensation expense

The impact on our results of operations of recording stock-based compensation expense for the three and six months ended June 30, 2015 and 2014 was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(In millions)
Cost of net revenues	$	20	$	16	$	38	$	30
Sales and marketing	39		41		82		79
Product development	58		57		113		106
General and administrative	81		48		137		92
Total stock-based compensation expense	$	198	$	162	$	370	$	307
Capitalized in product development	$	5	$	4	$	9	$	8

Stock option valuation assumptions

The following weighted average assumptions were used for the three and six months ended June 30, 2015 and 2014:  

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Risk-free interest rate	1.35	%	1.18	%	1.36	%	1.18	%
Expected life (in years)	3.9		4.1		4.0		4.1
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	27	%	29	%	27	%	29	%