Revenue Recognition - Contract Cost (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Contract acquisition costs
Capitalized Contract Cost
Beginning of period balance	$ 70,000,000	$ 69,000,000	$ 70,000,000	$ 76,000,000
Costs incurred	12,000,000	12,000,000	36,000,000	39,000,000
Amortization	(12,000,000)	(14,000,000)	(36,000,000)	(44,000,000)
Change in contract costs held for sale			0	(4,000,000)
End of period balance	70,000,000	67,000,000	70,000,000	67,000,000
Contract acquisition costs | Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Capitalized Contract Cost
Beginning of period balance		10,000,000		6,000,000
End of period balance		10,000,000		10,000,000
Contract fulfillment costs
Capitalized Contract Cost
Beginning of period balance	116,000,000	102,000,000	97,000,000	106,000,000
Costs incurred	24,000,000	24,000,000	76,000,000	68,000,000
Amortization	(20,000,000)	(18,000,000)	(53,000,000)	(52,000,000)
Change in contract costs held for sale			0	(14,000,000)
End of period balance	$ 120,000,000	108,000,000	$ 120,000,000	108,000,000
Contract fulfillment costs | Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Capitalized Contract Cost
Beginning of period balance		14,000,000		0
End of period balance		$ 14,000,000		$ 14,000,000