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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Worksite Employee Changes (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Condensed Cash Flow Statements |  |
Accounts receivable, net | $ 1 | $ (4)
Payroll funds receivable |  | 0
Prepaid expenses, net | 9 | (18)
Other assets | (18) | (35)
Other payroll assets | 0 | 2
Accounts payable and other liabilities | (5) | (8)
Client deposits and other client liabilities | (1) | (9)
Accrued wages | (10) | (20)
Accrued health insurance costs, net | 1 | (1)
Accrued workers' compensation costs, net | (1) | (14)
Payroll taxes liabilities and other payroll withholdings | (14) | (8)
Net cash used in operating activities |  | (115)
Purchases of marketable securities | (41) | (137)
Net cash used in investing activities |  | (137)
Change in WSE and TriNet Trust related assets and liabilities, net | $ 310 | 377
Net cash used in financing activities |  | (377)
As previously reported |  |
Condensed Cash Flow Statements |  |
Accounts receivable, net |  | 3
Payroll funds receivable |  | (38)
Prepaid expenses, net |  | (9)
Other assets |  | (33)
Other payroll assets |  | (419)
Accounts payable and other liabilities |  | (11)
Client deposits and other client liabilities |  | 5
Accrued wages |  | 43
Accrued health insurance costs, net |  | 7
Accrued workers' compensation costs, net |  | (21)
Payroll taxes liabilities and other payroll withholdings |  | (17)
Net cash used in operating activities |  | (490)
Purchases of marketable securities |  | (139)
Net cash used in investing activities |  | (139)
Change in WSE and TriNet Trust related assets and liabilities, net |  | 0
Net cash used in financing activities |  | 0
Reclassified amounts |  |
Condensed Cash Flow Statements |  |
Accounts receivable, net |  | (7)
Payroll funds receivable |  | 38
Prepaid expenses, net |  | (9)
Other assets |  | (2)
Other payroll assets |  | 421
Accounts payable and other liabilities |  | 3
Client deposits and other client liabilities |  | (14)
Accrued wages |  | (63)
Accrued health insurance costs, net |  | (8)
Accrued workers' compensation costs, net |  | 7
Payroll taxes liabilities and other payroll withholdings |  | 9
Net cash used in operating activities |  | 375
Purchases of marketable securities |  | 2
Net cash used in investing activities |  | 2
Change in WSE and TriNet Trust related assets and liabilities, net |  | 377
Net cash used in financing activities |  | $ (377)

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