Revenue Recognition - Contract Cost (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Contract acquisition costs
Capitalized Contract Cost
Beginning balance	$ 69,000,000	$ 78,000,000	$ 76,000,000	$ 76,000,000
Costs incurred	12,000,000	16,000,000	39,000,000	45,000,000
Amortization	(14,000,000)	(14,000,000)	(44,000,000)	(41,000,000)
Change in contract costs held for sale	0	0	(4,000,000)	0
Ending balance	67,000,000	80,000,000	67,000,000	80,000,000
Contract acquisition costs | Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Capitalized Contract Cost
Beginning balance	10,000,000		6,000,000
Ending balance	10,000,000		10,000,000
Contract acquisition costs | Discontinued Operations, Held-for-sale | Latin American Business
Capitalized Contract Cost
Beginning balance		0		0
Ending balance		0		0
Contract fulfillment costs
Capitalized Contract Cost
Beginning balance	102,000,000	101,000,000	106,000,000	99,000,000
Costs incurred	24,000,000	20,000,000	68,000,000	63,000,000
Amortization	(18,000,000)	(17,000,000)	(52,000,000)	(57,000,000)
Change in contract costs held for sale	0	1,000,000	(14,000,000)	0
Ending balance	108,000,000	105,000,000	108,000,000	105,000,000
Contract fulfillment costs | Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Capitalized Contract Cost
Beginning balance	14,000,000		0
Ending balance	$ 14,000,000		$ 14,000,000
Contract fulfillment costs | Discontinued Operations, Held-for-sale | Latin American Business
Capitalized Contract Cost
Beginning balance		28,000,000		27,000,000
Ending balance		$ 0		$ 0