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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Insurance [Abstract]            
Total accrued costs, end of period $ 224 $ 236 $ 238 $ 244 $ 250 $ 255
Collateral paid to carriers and offset against accrued costs (12)   (13)      
Total accrued costs, net of carrier collateral offset 212   225      
Payable in less than 1 year (net of collateral paid to carriers of $3 at June 30, 2019 and December 31, 2018) 64   67      
Payable in more than 1 year (net of collateral paid to carriers of $9 and $10 at June 30, 2019 and December 31, 2018, respectively) $ 148   $ 158