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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Total accrued costs, beginning of period | $ 224 | $ 244 | $ 238 | $ 255
Incurred |  |  |  |
Current year | 19 | 20 | 54 | 59
Prior years | (6) | (4) | (22) | (17)
Total incurred | 13 | 16 | 32 | 42
Paid |  |  |  |
Current year | (5) | (6) | (8) | (8)
Prior years | (11) | (9) | (41) | (44)
Total paid | (16) | (15) | (49) | (52)
Total accrued costs, end of period | $ 221 | $ 245 | $ 221 | $ 245

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