Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Restricted Share Activity

Activity for RSAs and PSUs is summarized below:

	RSAs		PSUs		Total		Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2019	447,680		324,078		771,758		$	102.01
Granted	294,319		160,929		455,248		122.20
Vested	(151,110	)	(7,368	)	(158,478	)	92.92
Forfeited	(12,202	)	(22,826	)	(35,028	)	101.60
Unvested balance, March 31, 2020	578,687		454,813		1,033,500		$	112.31

The aggregate fair values of RSAs and PSUs granted and vested are presented in the following table:

	Three Months Ended March 31,
	2020		2019
	(In millions)
Granted:
RSAs	$	36	$	30
PSUs	19		18
Total granted	$	55	$	48
Vested:
RSAs	$	19	$	16
PSUs	1		2
Total vested	$	20	$	18