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Accrued Workers' Compensation Costs - Summary of Activities in Liability for Unpaid Claims and Claims Adjustment Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense |  |  |
Total accrued costs, beginning of year | $ 255 | $ 255 | $ 190
Incurred |  |  |
Current year | 80 | 98 | 113
Prior years | (28) | (6) | 28
Total incurred | 52 | 92 | 141
Paid |  |  |
Current year | (12) | (14) | (14)
Prior years | (57) | (78) | (62)
Total paid | (69) | (92) | (76)
Total accrued costs, end of year | $ 238 | $ 255 | $ 255

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