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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Worksite Employee Changes (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Condensed Cash Flow Statements |  |
Accounts receivable, net | $ 1 | $ (5)
Payroll funds receivable |  | 0
Prepaid expenses, net | 14 | (12)
Other assets | (30) | (42)
Other payroll assets | 0 | 3
Accounts payable and other liabilities | 0 | (10)
Client deposits and other client liabilities | (1) | (9)
Accrued wages | (15) | (23)
Accrued health insurance costs, net | 0 | (2)
Accrued workers' compensation costs, net | 0 | (14)
Payroll taxes liabilities and other payroll withholdings | (12) | (8)
Net cash used in operating activities |  | (122)
Change in WSE and TriNet Trust related assets and liabilities, net | $ (303) | (490)
Net cash used in financing activities |  | (490)
As previously reported |  |
Condensed Cash Flow Statements |  |
Accounts receivable, net |  | 2
Payroll funds receivable |  | (64)
Prepaid expenses, net |  | 3
Other assets |  | (44)
Other payroll assets |  | (502)
Accounts payable and other liabilities |  | (13)
Client deposits and other client liabilities |  | (27)
Accrued wages |  | 52
Accrued health insurance costs, net |  | 18
Accrued workers' compensation costs, net |  | (19)
Payroll taxes liabilities and other payroll withholdings |  | (18)
Net cash used in operating activities |  | (612)
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 |  | 64
Prepaid expenses, net |  | (15)
Other assets |  | 2
Other payroll assets |  | 505
Accounts payable and other liabilities |  | 3
Client deposits and other client liabilities |  | 18
Accrued wages |  | (75)
Accrued health insurance costs, net |  | (20)
Accrued workers' compensation costs, net |  | 5
Payroll taxes liabilities and other payroll withholdings |  | 10
Net cash used in operating activities |  | 490
Change in WSE and TriNet Trust related assets and liabilities, net |  | (490)
Net cash used in financing activities |  | $ (490)

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