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Accrued Workers' Compensation Costs - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Total accrued costs, beginning of period | $ 205 | $ 217 | $ 205 | $ 214
Incurred |  |  |  |
Current year | 18 | 13 | 33 | 33
Prior years | (12) | (6) | (15) | (9)
Total incurred | 6 | 7 | 18 | 24
Paid |  |  |  |
Current year | (2) | (2) | (3) | (3)
Prior years | (11) | (11) | (22) | (24)
Total paid | (13) | (13) | (25) | (27)
Total accrued costs, end of period | $ 198 | $ 211 | $ 198 | $ 211

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