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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Share-Based Compensation Expense The following table shows the total share-based compensation expense resulting from equity awards and the 15.0% discount for the ESPP for the three months ended March 31, 2020 and 2019 in the Condensed Consolidated Statements of Income:
 Three Months Ended March 31,
 20202019
 (in millions)
Share-based compensation expense before income taxes
$17  $16  
Income tax benefit(5) (4) 
Share-based compensation expense after income taxes
$12  $12  
Summary of Restricted Stock Activity
The following table summarizes our restricted stock activity for the three months ended March 31, 2020:
Restricted Stock
 Number of AwardsWeighted-Average Grant Date Fair Value
Unvested balances at January 1, 2020
1,486,756  $77.38  
Granted24,373  $102.24  
Vested(365,385) $68.48  
Forfeited(32,205) $79.09  
Unvested balances at March 31, 20201,113,539  $80.79  
Summary of PSU Activity
The following table summarizes our PSU activity for the three months ended March 31, 2020:
PSUs
One-Year ProgramThree-Year Program
 Number of Awards Weighted-Average Grant Date Fair ValueNumber of AwardsWeighted-Average Grant Date Fair Value
Unvested balances at January 1, 2020
317,251  $80.87  797,451  $98.31  
Granted(1)
26,780  $84.17  45,091  $82.91  
Vested(3,668) $66.12  (300,767) $81.57  
Forfeited(12,833) $82.40  (6,079) $96.22  
Unvested balances at March 31, 2020
327,530  $81.24  535,696  $106.43  
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(1) Excludes the all employee grant which occurred on April 1, 2020.
Summary of Stock Option Activity
A summary of stock option activity for the three months ended March 31, 2020 is as follows:
 Number of Stock OptionsWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term (in years)Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2020
379,102  $54.32  5.27$20  
Exercised(27,196) 20.98  
Forfeited(435) 19.75  
Outstanding and Exercisable at March 31, 2020
351,471  $56.94  5.40$13