Discontinued Operations - Summary of Assets and Liabilities Held for Sale on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets
Current assets of discontinued operations	$ 0	$ 1,523
Long-term assets of discontinued operations	0	948
Liabilities
Current liabilities of discontinued operations	0	1,370
Long-term liabilities of discontinued operations	0	68
Payroll & Professional Services | Discontinued Operations, Disposed of by Sale
Assets
Cash and cash equivalents	0	34
Receivables, net	0	263
Other current assets	0	59
Fiduciary assets	0	1,167
Current assets of discontinued operations	0	1,523
Goodwill	0	331
Intangible assets, net	0	418
Fixed assets, net	0	40
Deferred tax assets, net	0	3
Other assets	0	156
Long-term assets of discontinued operations	0	948
Liabilities
Accounts payable and accrued liabilities	0	119
Other current liabilities	0	84
Fiduciary liabilities	0	1,167
Current liabilities of discontinued operations	0	1,370
Other liabilities	0	68
Long-term liabilities of discontinued operations	$ 0	$ 68