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Deferred Revenue (Tables)
 6 Months Ended
Jun. 30, 2022
Revenue Recognition And Deferred Revenue [Abstract]  
Summary of Deferred Revenue Activity

Deferred revenue activity consists of the following (dollars in millions):

 

 

 

Three Months Ended
June 30,

 

 

Six Months Ended
June 30,

 

 

 

2022

 

 

2021

 

 

2022

 

 

2021

 

Beginning balance

 

$

132

 

 

$

142

 

 

$

136

 

 

$

143

 

Increases

 

 

13

 

 

 

9

 

 

 

20

 

 

 

16

 

Revenue earned

 

 

(10

)

 

 

(9

)

 

 

(21

)

 

 

(17

)

Ending balance

 

$

135

 

 

$

142

 

 

$

135

 

 

$

142