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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