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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Total accrued costs, beginning of period | $ 214 | $ 238
Incurred |  |
Current year | 20 | 19
Prior years | (3) | (5)
Total incurred | 17 | 14
Paid |  |
Current year | (1) | (1)
Prior years | (13) | (15)
Total paid | (14) | (16)
Total accrued costs, end of period | $ 217 | $ 236

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