Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022
Acquisition Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 182	$ 202
Costs incurred	33	36
Amortization	(33)	(41)
Change in contract costs held for sale	0	(5)
End of period balance	182	192	$ 202
Acquisition Costs | Discontinued Operations | EMEA Business
Capitalized Contract Cost [Roll Forward]
Classified as held for sale		11	6
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	184	192
Costs incurred	36	40
Amortization	(31)	(35)
Change in contract costs held for sale	0	(15)
End of period balance	$ 189	182	192
Fulfillment Costs | Discontinued Operations | EMEA Business
Capitalized Contract Cost [Roll Forward]
Classified as held for sale		$ 15	$ 0