Discontinued Operations and Assets Held for Sale - Summary of Income (loss) from Discontinued Operations on Condensed Consolidated Statements of Comprehensive Income (loss) (Details) - Payroll & Professional Services Business - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 257	$ 245
Cost of services, exclusive of depreciation and amortization	187	173
Depreciation and amortization	3	2
Gross Profit	67	70
Selling, general and administrative	37	34
Depreciation and intangible amortization	8	9
Total Operating Expenses	45	43
Income (loss) from Discontinued Operations	22	27
Other (income) expense, net	2	2
Income (Loss) from Discontinued Operations Before Income Taxes	20	25
Income tax expense (benefit)	15	15
Net Income (Loss) from Discontinued Operations, Net of Tax	$ 5	$ 10