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Accrued Workers' Compensation Costs - Summary of Workers' Compensation Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total accrued costs, end of year $ 238 $ 255 $ 255 $ 190
Collateral paid to carriers and offset against accrued costs (13) (23)    
Total loss reserves, net of carrier collateral offset 225 232    
Accrued workers' compensation costs, net 67 67    
Payable in more than 1 year 158 165    
Collateral paid to carriers, current 3 6    
Collateral paid to carriers, noncurrent 10 17    
WSE        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total loss reserves, net of carrier collateral offset 225 232    
Accrued workers' compensation costs, net 67 67    
Payable in more than 1 year $ 158 $ 165