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v3.19.1

Description of Business and Significant Accounting Policies - Effects on cash flow due to new accounting pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable | $ 1 | $ 13
Unbilled revenue | (9) | 11
Prepaid income taxes |  | 0
Prepaid expenses and other current assets | (12) | (11)
Workers' compensation collateral receivable |  | 0
Other assets | (30) | (24)
Accounts payable and other current liabilities | 9 | (15)
Client deposits | (19) | (26)
Accrued wages | 17 | (15)
Accrued corporate wages |  | 0
Accrued health insurance costs | 0 | (1)
Accrued workers' compensation costs | (2) | (3)
Workers' compensation loss reserves and other non-current liabilities |  | 0
Payroll taxes payable and other payroll withholdings |  | (534)
Other liabilities | $ (3) | (4)
Worksite employee related assets |  | 0
Worksite employee related liabilities |  | 0
As previously reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable |  | 0
Unbilled revenue |  | 0
Prepaid income taxes |  | 13
Prepaid expenses and other current assets |  | (9)
Workers' compensation collateral receivable |  | (1)
Other assets |  | (2)
Accounts payable and other current liabilities |  | (15)
Client deposits |  | 0
Accrued wages |  | 0
Accrued corporate wages |  | (9)
Accrued health insurance costs |  | 0
Accrued workers' compensation costs |  | 0
Workers' compensation loss reserves and other non-current liabilities |  | (6)
Payroll taxes payable and other payroll withholdings |  | 0
Other liabilities |  | 0
Worksite employee related assets |  | 14
Worksite employee related liabilities |  | (566)
Reclassified amounts |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable |  | 13
Unbilled revenue |  | 11
Prepaid income taxes |  | (13)
Prepaid expenses and other current assets |  | (2)
Workers' compensation collateral receivable |  | 1
Other assets |  | (22)
Accounts payable and other current liabilities |  | 0
Client deposits |  | (26)
Accrued wages |  | (15)
Accrued corporate wages |  | 9
Accrued health insurance costs |  | (1)
Accrued workers' compensation costs |  | (3)
Workers' compensation loss reserves and other non-current liabilities |  | 6
Payroll taxes payable and other payroll withholdings |  | (534)
Other liabilities |  | (4)
Worksite employee related assets |  | 14
Worksite employee related liabilities |  | $ 566

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