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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of restricted stock activity under the Plan

A summary of restricted stock activity during the year ended December 31, 2021 is presented below.

			Restricted Stock Awards												Restricted Stock Units												Performance Restricted Stock Units
			Shares						Weighted- Average Grant-Date Fair Value						Shares						Weighted- Average Grant-Date Fair Value						Shares						Weighted- Average Grant-Date Fair Value
Outstanding as of December 31, 2020			50,895						$	27.51					614,094						$	43.70					445,498						$	45.72
Granted			35,508						49.28						389,059						38.69						243,845						48.25
Restrictions lapsed (vested)(1)			(50,895)						27.51						(310,061)						43.38						(243,406)						45.73
Forfeited			—						—						(32,243)						42.02						(20,669)						47.42
Outstanding as of December 31, 2021			35,508						49.28						660,849						40.98						425,268						46.83

_______________________________________________________________________________

(1)For performance restricted stock units, the shares represent the performance restricted stock units granted in 2018, for which the three-year performance period ended December 31, 2020.

Summary of stock option activity under the plan

A summary of stock option activity during the year ended December 31, 2021 is presented below:

			Shares						Weighted- Average Exercise Price
Outstanding as of December 31, 2020			4,569,041						$	40.41
Exercised			(1,806,940)						36.45
Forfeited			—						—
Expired			(124,515)						53.80
Outstanding as of December 31, 2021			2,637,586						42.48
Exercisable as of December 31, 2021			2,637,586						42.48

			Weighted- Average Remaining Contractual Term (years)						Aggregate Intrinsic Value(1) (in millions)
Outstanding as of December 31, 2021			3.5						$	75
Exercisable as of December 31, 2021			3.5						$	75

_____________________________________________________________________________

(1)The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $70.78 as of December 31, 2021, which would have been received by the option holders had all option holders exercised their options as of that date.

Summary of selected amounts pertaining to stock option exercises

Selected amounts pertaining to stock option exercises are as follows:

			Year ended December 31,
			2021						2020						2019
			(in millions)
Cash received from stock option exercises			$	64					$	8					$	18
Actual tax benefit realized from stock option exercises			$	9					$	1					$	3
Pre-tax intrinsic value of stock options exercised			$	39					$	4					$	12

Summary of information about stock options outstanding and exercisable

			Year ended December 31,
			2021						2020						2019
			(in millions)
Cash received from stock option exercises			$	64					$	8					$	18
Actual tax benefit realized from stock option exercises			$	9					$	1					$	3
Pre-tax intrinsic value of stock options exercised			$	39					$	4					$	12

Summary of selected amounts pertaining to restricted stock that vested

.

Summary of stock-based compensation costs and related income tax benefits

The following table summarizes stock-based compensation costs and related income tax benefits:

			Year ended December 31,
			2021						2020						2019
			(in millions)
Stock-based compensation expense			$	30					$	26					$	28
Income tax benefit			(7)						(6)						(6)
Stock-based compensation expense, net of income taxes			$	23					$	20					$	22

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