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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
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