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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Total accrued costs, beginning of period $ 211 $ 224 $ 214 $ 238
Incurred        
Current year 15 19 48 54
Prior years (3) (6) (12) (22)
Total incurred 12 13 36 32
Paid        
Current year (2) (5) (5) (8)
Prior years (11) (11) (35) (41)
Total paid (13) (16) (40) (49)
Total accrued costs, end of period $ 210 $ 221 $ 210 $ 221