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Description of Business and Significant Accounting Policies - Reclassification of balance sheet accounts (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Restricted cash, cash equivalents and investments $ 942 $ 1,280
Accounts receivable 11 21
Unbilled revenues, net 304 297
Prepaid income taxes   0
Prepaid expenses 48 38
Other current assets 59 19
Worksite employee related assets   0
Workers' compensation collateral receivable   0
Deferred and other long term income taxes   0
Other assets 78 55
Accounts payable and other current liabilities 45 59
Accrued wages 352 329
Client deposits 56 52
Accrued health insurance costs, net 135 151
Accrued workers' compensation costs, net 67 67
Payroll tax liabilities and other payroll withholdings 729 1,034
Accrued workers' compensation costs, net 225 232
Insurance premiums and other payables $ 19 25
Other current liabilities   0
Worksite employee related liabilities   0
As Previously Reported    
Restricted cash, cash equivalents and investments   15
Accounts receivable   0
Unbilled revenues, net   0
Prepaid income taxes   5
Prepaid expenses   8
Other current assets   2
Worksite employee related assets   1,625
Workers' compensation collateral receivable   39
Deferred and other long term income taxes   2
Other assets   14
Accounts payable and other current liabilities   45
Accrued wages   40
Client deposits   0
Accrued health insurance costs, net   0
Accrued workers' compensation costs, net   0
Payroll tax liabilities and other payroll withholdings   0
Insurance premiums and other payables   0
Other current liabilities   14
Worksite employee related liabilities   1,618
Restatement Adjustment    
Restricted cash, cash equivalents and investments   1,265
Accounts receivable   21
Unbilled revenues, net   297
Prepaid income taxes   (5)
Prepaid expenses   30
Other current assets   17
Worksite employee related assets   (1,625)
Workers' compensation collateral receivable   (39)
Deferred and other long term income taxes   (2)
Other assets   41
Accounts payable and other current liabilities   14
Accrued wages   289
Client deposits   52
Accrued health insurance costs, net   151
Accrued workers' compensation costs, net   67
Payroll tax liabilities and other payroll withholdings   1,034
Insurance premiums and other payables   25
Other current liabilities   (14)
Worksite employee related liabilities   $ (1,618)