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Accrued Workers' Compensation Costs - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Total accrued costs, beginning of period	$ 205	$ 217	$ 205	$ 214
Incurred
Current year	18	13	33	33
Prior years	(12)	(6)	(15)	(9)
Total incurred	6	7	18	24
Paid
Current year	(2)	(2)	(3)	(3)
Prior years	(11)	(11)	(22)	(24)
Total paid	(13)	(13)	(25)	(27)
Total accrued costs, end of period	$ 198	$ 211	$ 198	$ 211

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