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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Insurance [Abstract]
Total accrued costs, end of period	$ 221	$ 224	$ 238	$ 245	$ 244	$ 255
Collateral paid to carriers and offset against accrued costs	(12)		(13)
Total accrued costs, net of carrier collateral offset	209		225
Payable in less than 1 year (net of collateral paid to carriers of $3 and $3 at September 30, 2019 and December 31, 2018, respectively)	63		67
Payable in more than 1 year (net of collateral paid to carriers of $9 and $10 at September 30, 2019 and December 31, 2018, respectively)	$ 146		$ 158

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Liability for Unpaid Claims and Claims Adjustment Expense, Collateral

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- Definition

Sum of adjustments to the estimated reserve for unpaid claims and claims adjustment expense.

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-Publisher FASB
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- Definition

Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the noncurrent portion of the liabilities (due beyond one year; or beyond one operating cycle if longer).

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