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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]        
Total accrued costs, end of period $ 236 $ 238 $ (250) $ 255
Collateral paid to carriers and offset against accrued costs (13) (13)    
Total accrued costs, net of carrier collateral offset 223 225    
Payable in less than 1 year (net of collateral paid to carriers of $4 and $3 at March 31, 2019 and December 31, 2018, respectively) 67 67    
Payable in more than 1 year (net of collateral paid to carriers of $9 and $10 at March 31, 2019 and December 31, 2018, respectively) 156 158    
Worksite Employee [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Payable in less than 1 year (net of collateral paid to carriers of $4 and $3 at March 31, 2019 and December 31, 2018, respectively) 67 67    
Payable in more than 1 year (net of collateral paid to carriers of $9 and $10 at March 31, 2019 and December 31, 2018, respectively) $ 156 $ 158