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Deferred Revenue (Tables)
 12 Months Ended
Dec. 31, 2023
Revenue Recognition and Deferred Revenue [Abstract]  
Summary of Deferred Revenue Activity Deferred revenue activity consisted of the following (dollars in millions):

 

 

Year ended
December 31,
2023

 

 

Year ended
December 31,
2022

 

 

Year ended
December 31,
2021

 

Beginning balance

 

$

131

 

 

$

136

 

 

$

143

 

Increases

 

 

52

 

 

 

35

 

 

 

29

 

Revenue earned

 

 

(53

)

 

 

(40

)

 

 

(36

)

Ending balance

 

$

130

 

 

$

131

 

 

$

136