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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Insurance [Abstract]            
Total accrued costs, end of period $ 210 $ 211 $ 214 $ 221 $ 224 $ 238
Collateral paid to carriers and offset against accrued costs (8)   (9)      
Total accrued costs, net of carrier collateral offset 202   205      
Payable in less than 1 year
(net of collateral paid to carriers of $3 at September 30, 2020 and December 31, 2019) 60   61      
Payable in more than 1 year 
(net of collateral paid to carriers of $5 and $6 at September 30, 2020 and December 31, 2019, respectively) 142   144      
Net of collateral paid to carriers, payable in less than one year (3)   (3)      
Net of collateral paid to carriers, payable in more than 1 year $ (5)   $ 6