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Income Taxes Reconciliation of Effective Tax Rate (Details)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory rate		21.00%	21.00%	21.00%
State and local income taxes, net of federal tax benefits		3.00%	6.00%	6.00%
Discontinued operations—establishment/reversal of deferred tax liability (a)	[1]	10.00%	(26.00%)	0.00%
Non-deductible equity compensation		(2.00%)	(4.00%)	2.00%
Non-deductible executive compensation		(1.00%)	(1.00%)	1.00%
Goodwill impairment		(7.00%)	(3.00%)	0.00%
Meals & entertainment		0.00%	(1.00%)	1.00%
Uncertain tax positions		0.00%	0.00%	(1.00%)
Net change in valuation allowance		(1.00%)	0.00%	2.00%
Effective income tax rate		23.00%	(8.00%)	32.00%
[1] See Note 1, "Basis of Presentation—Inclusion of Cartus Relocation Services in Continuing Operations". This item reflects the tax impact from the 2019 recognition of gain on the pending sale of Cartus Relocation Services (previously recorded in discontinued operations) and the 2020 de-recognition of that gain.

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- Definition

Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation [Concept] Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible executive compensation.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to uncertain tax positions.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to impairment loss.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to meals and entertainment expense.

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