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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Total accrued costs, beginning of period	$ 238	$ 255
Incurred
Current year	19	20
Prior years	(5)	(7)
Total incurred	14	13
Paid
Current year	(1)	0
Prior years	(15)	(18)
Total paid	(16)	(18)
Total accrued costs, end of period	$ (236)	$ 250

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