Revenue (Deferred Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 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	132	103
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(100)	(91)
Ending Balance	$ 138	$ 106