Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Provision for (Benefit from) Income Taxes

The provision for (benefit from) income taxes consists of the following (in millions):

	Year Ended December 31,
	2021			2020			2019
Current:
Federal	$	(46	)	$	(1	)	$	(38	)
State		6			3			(5	)
		(40	)		2			(43	)
Deferred:
Federal		161			(162	)		179
State		10			(25	)		24
		171			(187	)		203
Total provision for (benefit from) income taxes for income (loss)	$	131		$	(185	)	$	160

Schedule of Reconciliation between the Statutory Federal Income Tax Rate and the Effective Tax Rate

The following table reconciles the differences between the statutory federal income tax rate and the effective tax rate (dollars in millions):

	Year Ended December 31,
	2021						2020						2019
	Amount			%			Amount			%			Amount			%
Provision for (benefit from) income taxes at statutory federal rate	$	105			21.0	%	$	89			21.0	%	$	(90	)		21.0	%
State income taxes, net of federal income tax benefit		44			8.7			(15	)		(3.6	)		(104	)		24.3
Net income attributable to noncontrolling interests		(29	)		(5.8	)		(20	)		(4.7	)		(18	)		4.2
Change in valuation allowance		33			6.8			(267	)		(63.2	)		340			(79.2	)
Nondeductible goodwill		—			—			41			9.8			11			(2.6	)
Amended return adjustments		(22	)		(4.4	)		—			—			—			—
Nondeductible loss on divestiture		—			—			(15	)		(3.4	)		15			(3.5	)
Other		—			—			2			0.3			6			(1.4	)
Provision for (benefit from) income taxes and effective tax rate for income (loss)	$	131			26.3	%	$	(185	)		(43.8	)%	$	160			(37.2	)%

Schedule of Components of Deferred Income Taxes

Deferred income taxes are based on the estimated future tax effects of differences between the financial statement and tax bases of assets and liabilities under the provisions of the enacted tax laws. Deferred income taxes as of December 31, 2021 and 2020 consist of (in millions):

	December 31,
	2021					2020
	Assets			Liabilities		Assets			Liabilities
Net operating loss and credit carryforwards	$	833		$	—	$	873		$	—
Property and equipment		—			343		—			300
Self-insurance liabilities		49			—		58			—
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
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 assets		—			137		—			150
Right-of-use liability		142			—		155			—
Stock-based compensation		4			—		4			—
Deferred compensation		64			—		69			—
IRC Section 481(a) Adjustments		—			191		—			—
Other		38			—		57			—
Total		1,587			912		1,590			778
Valuation allowance		(814	)		—		(781	)		—
Total deferred income taxes	$	773		$	912	$	809		$	778

Schedule of Reconciliation of the Total Amount of Unrecognized Tax Benefit

The following is a tabular reconciliation of the total amount of unrecognized tax benefit for the years ended December 31, 2021, 2020 and 2019 (in millions):

	Year Ended December 31,
	2021			2020		2019
Unrecognized tax benefit, beginning of year	$	45		$	26	$	29
Gross increases — tax positions in current period		5			19		10
Reductions — tax positions in prior period		(8	)		—		—
Settlements		—			—		(13	)
Unrecognized tax benefit, end of year	$	42		$	45	$	26