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Description of Business and Significant Accounting Policies - Effects on cash flow due to new accounting pronouncements (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities    
Accounts receivable, net $ 5 $ 12
Unbilled revenue, net (61) (3)
Prepaid income taxes, net   0
Prepaid expenses and other current assets   0
Prepaid expenses, net (17) (26)
Workers' compensation collateral receivable   0
Accounts payable and other current liabilities (16) (18)
Client deposits (28) (17)
Accrued wages 53 34
Accrued corporate wages   0
Accrued health insurance costs, net 21 (7)
Accrued workers' compensation costs, net (16) (5)
Payroll taxes payable and other payroll withholdings   (616)
Worksite employee related assets   0
Worksite employee related liabilities   0
Other assets (34) (54)
Other liabilities $ (13) (6)
As previously reported    
Operating activities    
Accounts receivable, net   0
Unbilled revenue, net   0
Prepaid income taxes, net   1
Prepaid expenses and other current assets   (24)
Prepaid expenses, net   0
Workers' compensation collateral receivable   (10)
Accounts payable and other current liabilities   (9)
Client deposits   0
Accrued wages   0
Accrued corporate wages   (4)
Accrued health insurance costs, net   0
Accrued workers' compensation costs, net   0
Payroll taxes payable and other payroll withholdings   0
Worksite employee related assets   (51)
Worksite employee related liabilities   (609)
Other assets   0
Other liabilities   0
Reclassified amounts    
Operating activities    
Accounts receivable, net   12
Unbilled revenue, net   (3)
Prepaid income taxes, net   (1)
Prepaid expenses and other current assets   24
Prepaid expenses, net   (26)
Workers' compensation collateral receivable   10
Accounts payable and other current liabilities   (9)
Client deposits   (17)
Accrued wages   34
Accrued corporate wages   4
Accrued health insurance costs, net   (7)
Accrued workers' compensation costs, net   (5)
Payroll taxes payable and other payroll withholdings   (616)
Worksite employee related assets   51
Worksite employee related liabilities   609
Other assets   (54)
Other liabilities   $ (6)