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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

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