Stock-Based Plans (Tables)

3 Months Ended

Mar. 31, 2018

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

Schedule of restricted stock units and performance-based restricted stock units

The following table summarizes the RSU and PBRSU activity under our equity incentive plans for the three months ended March 31, 2018:

	Units
	(In thousands)
Outstanding at January 1, 2018	33,875
Awarded(1)	12,103
Vested(1)	(9,663	)
Forfeited	(484	)
Outstanding at March 31, 2018	35,831
Expected to vest	30,871

⁽¹⁾ Includes approximately 2.1 million additional PBRSUs issued due to company performance in connection with the Company's 2017 annual incentive plan.

Schedule of stock-based compensation expense

The impact on our results of operations of recording stock-based compensation expense under our equity incentive plans for the three months ended March 31, 2018 and 2017 was as follows:

	Three Months Ended March 31,
	2018		2017
	(In millions)
Customer support and operations	$	38	$	30
Sales and marketing	44		28
Product development	64		45
General and administrative	59		42
Depreciation and amortization	4		2
Total stock-based compensation expense	$	209	$	147
Capitalized as part of internal use software and website development costs	$	7	$	3