Income Taxes - Schedule of Components of Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Net operating loss and credit carryforwards	$ 833	$ 873
Self-insurance liabilities	49	58
Long-term debt and interest	48	154
Accounts receivable	22	52
IRC Section 163(j) interest limitation	329	108
Accrued vacation	22	22
Accrued bonus	31	32
Other comprehensive income	5	6
Right-of-use liability	142	155
Stock-based compensation	4	4
Deferred compensation	64	69
Other		57
Total	1,587	1,590
Valuation allowance	(814)	(781)
Total Deferred Income Tax Assets, Net	773	809
Liabilities
Property and equipment	343	300
Prepaid expenses	30	29
Intangibles	144	127
Investments in unconsolidated affiliates	58	57
Other liabilities	9	9
IRC Section 481(a) - mixed service cost		106
Right-of-use assets	137	150
IRC Section 481(a) Adjustments	191
Total Deferred Income Tax Liabilities, Gross	$ 912	$ 778