Deferred Revenue (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2022			2021
Beginning balance	$	136		$	143
Increases		7			7
Revenue earned		(11	)		(8	)
Ending balance	$	132		$	142