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Short And Long-Term Debt Securitization Obligations (Details) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)	Jan. 31, 2022 GBP (£)	Dec. 31, 2021 GBP (£)
Debt Instrument [Line Items]
Securitization obligations	$ 118	[1]	$ 106
Securitization obligation
Debt Instrument [Line Items]
Relocation receivables and other related relocation assets that collateralize securitization obligations	132		135
Interest Expense, Debt	$ 4		$ 5
Weighted average interest rate on securitization obligations	3.10%		3.50%		3.10%
Apple Ridge Funding LLC | Securitization obligation
Debt Instrument [Line Items]
Total capacity, securitization obligations	$ 200
Securitization obligations	116	[1]	$ 102
Available capacity, debt	84
Cartus Financing Limited | Securitization obligation
Debt Instrument [Line Items]
Total capacity, securitization obligations	20
Securitization obligations	2	[1]	$ 4
Available capacity, debt	$ 18
Revolving Credit Facility | Cartus Financing Limited | Securitization obligation
Debt Instrument [Line Items]
Total capacity, securitization obligations | £					£ 5
Revolving Credit Facility | Cartus Financing Limited | Securitization obligation | Maximum Capacity
Debt Instrument [Line Items]
Total capacity, securitization obligations | £					10
Revolving Credit Facility | Cartus Financing Limited | Securitization obligation | Subsequent Event
Debt Instrument [Line Items]
Total capacity, securitization obligations | £				£ 2
Working Capital Facility | Cartus Financing Limited | Securitization obligation
Debt Instrument [Line Items]
Total capacity, securitization obligations | £					£ 5
[1] See below under the header "Securitization Obligations" for additional information.

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Underlying relocation receivables and other related relocation assets collateralizing securitization obligations.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Secured financing other than securities sold under agreements to repurchase and securities loaned.

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