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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Total accrued costs, beginning of period	$ 224	$ 244	$ 238	$ 255
Incurred
Current year	19	20	54	59
Prior years	(6)	(4)	(22)	(17)
Total incurred	13	16	32	42
Paid
Current year	(5)	(6)	(8)	(8)
Prior years	(11)	(9)	(41)	(44)
Total paid	(16)	(15)	(49)	(52)
Total accrued costs, end of period	$ 221	$ 245	$ 221	$ 245

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