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Accrued Workers' Compensation Costs - Summary of Workers' Compensation Loss Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Total accrued costs, beginning of period	$ 198	$ 205
Incurred
Current year	17	16
Prior years	(5)	(4)
Total incurred	12	12
Paid
Current year	0	(1)
Prior years	(11)	(11)
Total paid	(11)	(12)
Total accrued costs, end of period	$ 199	$ 205

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Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.

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