Discontinued Operations and Assets Held for Sale - Summary of Assets and Liabilities Held for Sale on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets
Current assets held for sale	$ 2,501	$ 1,523
Long-term assets held for sale		948
Liabilities
Current liabilities held for sale	1,475	1,370
Long-term liabilities held for sale		68
Payroll & Professional Services Business
Assets
Cash and cash equivalents	30	34
Receivables, net	259	263
Other current assets	63	59
Fiduciary assets	1,211	1,167
Goodwill	330
Intangible assets, net	408
Fixed assets, net	40
Deferred tax assets, net	6
Other assets	154
Current assets held for sale	2,501	1,523
Goodwill		331
Intangible assets, net		418
Fixed assets, net		40
Deferred tax assets, net		3
Other assets		156
Long-term assets held for sale		948
Liabilities
Accounts payable and accrued liabilities	105	119
Other current liabilities	89	84
Fiduciary liabilities	1,211	1,167
Other liabilities	70
Current liabilities held for sale	$ 1,475	1,370
Other liabilities		68
Long-term liabilities held for sale		$ 68