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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022 is presented below.
Restricted Stock AwardsRestricted Stock UnitsPerformance Restricted Stock Units
 SharesWeighted-
Average
Grant-Date
Fair Value		SharesWeighted-
Average
Grant-Date
Fair Value		SharesWeighted-
Average
Grant-Date
Fair Value
Outstanding as of December 31, 202135,508 $49.28 660,849 $40.98 425,268 $46.83 
Granted16,736 95.59 231,506 71.68 203,821 81.38 
Restrictions lapsed (vested)(1)
(35,508)49.28 (323,106)41.61 (214,203)46.57 
Forfeited— — (22,569)50.82 (3,201)63.06 
Outstanding as of December 31, 202216,736 95.59 546,680 53.21 411,685 63.95 
_______________________________________________________________________________
(1)For performance restricted stock units, the shares represent the performance restricted stock units granted in 2019, for which the three-year performance period ended December 31, 2021.
Summary of stock option activity under the plan A summary of stock option activity during the year ended December 31, 2022 is presented below:
 SharesWeighted-
Average
Exercise Price
Outstanding as of December 31, 20212,637,586 $42.48 
Exercised(2,475,550)42.79 
Outstanding as of December 31, 2022162,036 37.72 
Exercisable as of December 31, 2022162,036 37.72 

 Weighted-
Average
Remaining
Contractual
Term
(years)
Aggregate
Intrinsic
Value(1)
(in millions)
Outstanding as of December 31, 20222.9$8 
Exercisable as of December 31, 20222.9$8 
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(1)The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $85.20 as of December 31, 2022, 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,
202220212020
 (in millions)
Cash received from stock option exercises$106 $64 $8 
Actual tax benefit realized from stock option exercises$23 $9 $1 
Pre-tax intrinsic value of stock options exercised$100 $39 $4 
Summary of information about stock options outstanding and exercisable
Year ended December 31,
202220212020
 (in millions)
Cash received from stock option exercises$106 $64 $8 
Actual tax benefit realized from stock option exercises$23 $9 $1 
Pre-tax intrinsic value of stock options exercised$100 $39 $4 
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,
 202220212020
 (in millions)
Stock-based compensation expense$41 $30 $26 
Income tax benefit(9)(7)(6)
Stock-based compensation expense, net of income taxes$32 $23 $20