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Accrued Workers' Compensation Cost - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Total accrued costs, beginning of period	$ 217	$ 236	$ 214	$ 238
Incurred
Current year	13	16	33	35
Prior years	(6)	(11)	(9)	(16)
Total incurred	7	5	24	19
Paid
Current year	(2)	(2)	(3)	(3)
Prior years	(11)	(15)	(24)	(30)
Total paid	(13)	(17)	(27)	(33)
Total accrued costs, end of period	$ 211	$ 224	$ 211	$ 224

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