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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Insurance [Abstract]            
Total accrued costs, end of period $ 211 $ 217 $ 214 $ 224 $ 236 $ 238
Collateral paid to carriers and offset against accrued costs (8)   (9)      
Total accrued costs, net of carrier collateral offset 203   205      
Payable in less than 1 year (net of collateral paid to carriers of $2 and $3 at June 30, 2020 and December 31, 2019, respectively.) 62   61      
Payable in more than 1 year (net of collateral paid to carriers of $6 at June 30, 2020 and December 31, 2019 respectively.) 141   144      
Net of collateral paid to carriers, payable in less than one year 2   3      
Net of collateral paid to carriers, payable in more than 1 year $ 6   $ 6