Revenue (Deferred Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Contract Liability [Roll Forward]
Beginning Balance	$ 94	$ 78
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	103	91
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(91)	(75)
Ending Balance	$ 106	$ 94