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Description of Business and Significant Accounting Policies - Cash Flow Statement Adjustments Due to Adoption of ASU 2016-18 (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable | $ 10 | $ (14) | $ 0
Restricted cash, cash equivalents, and investments |  | 0 | 0
Unbilled revenue | (14) | (4) | (79)
Prepaid income taxes |  | 0 | 0
Prepaid expenses | (9) | 28 | (45)
Workers' compensation collateral receivable |  | 0 | 0
Accounts payable | (8) | 23 | 11
Client deposits | 4 | (4) | (2)
Accrued wages | 23 | 26 | 73
Accrued health insurance costs | (16) | 22 | 16
Accrued workers' compensation costs | (7) | 9 | 60
Payroll taxes payable and other payroll withholdings | (305) | 294 | (175)
Worksite employee related assets |  | 0 | 0
Worksite employee related liabilities |  | 0 | 0
Other assets | (64) | (11) | 174
Other liabilities | (1) | 17 | (9)
Net cash provided by operating activities | (104) | 606 | 192
Proceeds from issuance of common stock on exercised options |  | 0 | 0
Proceeds from issuance of common stock on employee stock purchase plan |  | 0 | 0
Proceeds from issuance of common stock | 14 | 16 | 9
Net increase in cash and cash equivalents | $ (389) | 505 | 61
Effect of Accounting Standards Update 2016-18 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable |  | 0 | 0
Restricted cash, cash equivalents, and investments |  | 46 | 42
Unbilled revenue |  | 0 | 0
Prepaid income taxes |  | 0 | 0
Prepaid expenses |  | 0 | 0
Workers' compensation collateral receivable |  | 0 | 0
Accounts payable |  | 0 | 0
Client deposits |  | 0 | 0
Accrued wages |  | 0 | 0
Accrued health insurance costs |  | 0 | 0
Accrued workers' compensation costs |  | 0 | 0
Payroll taxes payable and other payroll withholdings |  | 0 | 0
Worksite employee related assets |  | 307 | 1
Worksite employee related liabilities |  | 0 | 0
Other assets |  | 0 | 0
Other liabilities |  | 0 | 0
Net cash provided by operating activities |  | 353 | 43
Proceeds from issuance of common stock on exercised options |  | 0 | 0
Proceeds from issuance of common stock on employee stock purchase plan |  | 0 | 0
Proceeds from issuance of common stock |  | 0 | 0
Net increase in cash and cash equivalents |  | 353 | 43
As Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable |  | 0 | 0
Restricted cash, cash equivalents, and investments |  | (46) | (42)
Unbilled revenue |  | 0 | 0
Prepaid income taxes |  | 37 | (38)
Prepaid expenses |  | 1 | (2)
Workers' compensation collateral receivable |  | (7) | (3)
Accounts payable |  | 22 | 9
Client deposits |  | 0 | 0
Accrued wages |  | 11 | 4
Accrued health insurance costs |  | 0 | 0
Accrued workers' compensation costs |  | 12 | 55
Payroll taxes payable and other payroll withholdings |  | 0 | 0
Worksite employee related assets |  | (343) | 92
Worksite employee related liabilities |  | 342 | (94)
Other assets |  | 4 | 0
Other liabilities |  | 0 | 0
Net cash provided by operating activities |  | 253 | 149
Proceeds from issuance of common stock on exercised options |  | 11 | 5
Proceeds from issuance of common stock on employee stock purchase plan |  | 5 | 4
Proceeds from issuance of common stock |  | 0 | 0
Net increase in cash and cash equivalents |  | 152 | 18
Reclassified amounts |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable |  | (14) | 0
Restricted cash, cash equivalents, and investments |  | 0 | 0
Unbilled revenue |  | (4) | (79)
Prepaid income taxes |  | (37) | 38
Prepaid expenses |  | 27 | (43)
Workers' compensation collateral receivable |  | 7 | 3
Accounts payable |  | 1 | 2
Client deposits |  | (4) | (2)
Accrued wages |  | 15 | 69
Accrued health insurance costs |  | 22 | 16
Accrued workers' compensation costs |  | (3) | 5
Payroll taxes payable and other payroll withholdings |  | 294 | (175)
Worksite employee related assets |  | 36 | (93)
Worksite employee related liabilities |  | (342) | 94
Other assets |  | (15) | 174
Other liabilities |  | 17 | (9)
Net cash provided by operating activities |  | 0 | 0
Proceeds from issuance of common stock on exercised options |  | (11) | (5)
Proceeds from issuance of common stock on employee stock purchase plan |  | (5) | (4)
Proceeds from issuance of common stock |  | 16 | 9
Net increase in cash and cash equivalents |  | $ 0 | $ 0

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