Share-Based Payments (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock option activity is as follows:


	Number of shares (in thousands)	Weighted-average exercise price per stock option		Weighted-average remaining contractual term (in years)	Aggregate intrinsic value (in millions)
Outstanding stock options at December 31, 2020	11,297	$	53.84
Granted	709	93.35
Exercised	(1,412)	46.55
Forfeited	(486)	64.65
Expired	(17)	56.39
Outstanding stock options at June 30, 2021	10,091	$	57.11	7.42	$	387
Vested and expected to vest at June 30, 2021	9,596	$	56.17	7.34	$	377
Exercisable at June 30, 2021	2,898	$	41.43	5.16	$	157

Schedule of Restricted Stock Units Activity

The following table summarizes our RSU activity with performance-based RSUs, including those with market conditions, presented at 100% of the target level shares that may potentially vest (amounts in thousands, except per share data):


	Number of shares	Weighted- average grant date fair value per RSU
Unvested RSUs at December 31, 2020	7,102	$	82.50
Granted	4,215	96.57
Vested	(2,360)	104.79
Forfeited	(632)	70.59
Unvested RSUs at June 30, 2021	8,325	$	84.96