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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Activity for RSUs and PSUs

A summary of activity for RSUs and PSUs for the years ended December 31, 2021 and 2020, is as follows (in millions, except for per share data):

 

 

 

Shares

 

 

Weighted-Average Grant-Date Fair Value Per Share

 

Unvested, at January 1, 2020

 

 

—

 

 

$

—

 

   Granted

 

0.5

 

 

 

29

 

   Forfeited

 

 

(0.1

)

 

 

27

 

   Vested

 

 

—

 

 

 

—

 

Unvested, at December 31, 2020

 

 

0.4

 

 

$

29

 

   Granted

 

 

0.3

 

 

 

30

 

   Forfeited

 

 

—

 

 

 

—

 

   Vested

 

 

(0.1

)

 

 

28

 

   PSU performance adjustment

 

 

(0.2

)

 

 

30

 

Unvested, at December 31, 2021

 

 

0.4

 

 

$

29