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Accrued Workers' Compensation Costs - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Insurance [Abstract]            
Total accrued costs, end of period $ 198 $ 205 $ 205 $ 211 $ 217 $ 214
Collateral paid to carriers and offset against accrued costs (8)   (8)      
Total accrued costs, net of carrier collateral offset 190   197      
Payable in less than 1 year (net of collateral paid to carriers) 57   59      
Payable in more than 1 year (net of collateral paid to carriers) 133   138      
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   $ 5