Revenue (Deferred Revenue Activity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Contract Liability [Roll Forward]
Beginning Balance	$ 106	$ 94
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	35	27
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(25)	(34)
Ending Balance	$ 116	$ 87