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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Total accrued costs, beginning of period | $ 236 | $ 250 | $ 238 | $ 255
Incurred |  |  |  |
Current year | 16 | 19 | 35 | 39
Prior years | (11) | (6) | (16) | (13)
Total incurred | 5 | 13 | 19 | 26
Paid |  |  |  |
Current year | (2) | (2) | (3) | (2)
Prior years | (15) | (17) | (30) | (35)
Total paid | (17) | (19) | (33) | (37)
Total accrued costs, end of period | $ 224 | $ 244 | $ 224 | $ 244

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