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Deferred Revenue (Tables)
 9 Months Ended
Sep. 30, 2023
Revenue Recognition and Deferred Revenue [Abstract]  
Summary of Deferred Revenue Activity

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

 

 

 

Three Months Ended
September 30,

 

 

Nine Months Ended
September 30,

 

 

 

2023

 

 

2022

 

 

2023

 

 

2022

 

Beginning balance

 

$

139

 

 

$

135

 

 

$

131

 

 

$

136

 

Increases

 

 

13

 

 

 

8

 

 

 

42

 

 

 

28

 

Revenue earned

 

 

(14

)

 

 

(9

)

 

 

(35

)

 

 

(30

)

Ending balance

 

$

138

 

 

$

134

 

 

$

138

 

 

$

134