Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Acquisition Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 182	$ 202
Costs incurred	151	136
Amortization	(130)	(152)
Classified as held for sale		(4)
End of period balance	203	182
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	184	192
Costs incurred	176	157
Amortization	(138)	(140)
Classified as held for sale		(25)
End of period balance	$ 222	$ 184