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Workers' Compensation Loss Reserves - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Total loss reserves, beginning of period | $ 244 | $ 255 | $ 255 | $ 255
Incurred |  |  |  |
Current year | 20 | 22 | 59 | 70
Prior years | (4) | (4) | (17) | (3)
Total incurred | 16 | 18 | 42 | 67
Paid |  |  |  |
Current year | (6) | (4) | (8) | (9)
Prior years | (9) | (20) | (44) | (64)
Total paid | (15) | (24) | (52) | (73)
Total loss reserves, end of period | $ 245 | $ 249 | $ 245 | $ 249

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