Discontinued Operations and Disposal Groups (Details) £ in Millions			3 Months Ended
		Nov. 07, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected cash proceeds at closing from the planned sale of employee relocation business		$ 375
Expected deferred payment from the planned sale of employee relocation business		$ 25
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net revenues			$ 52,000,000	$ 60,000,000
Total expenses			58,000,000	77,000,000
Loss from discontinued operations			(6,000,000)	(17,000,000)
Estimated loss on the sale of discontinued operations (a)	[1]		(30,000,000)	0
Income tax benefit from discontinued operations			(9,000,000)	(3,000,000)
Net loss from discontinued operations			(27,000,000)	(14,000,000)
ASSETS
Cash and cash equivalents						$ 12,000,000	$ 28,000,000
Restricted cash						4,000,000	3,000,000
Trade receivables						36,000,000	46,000,000
Relocation receivables						188,000,000	203,000,000
Other current assets						13,000,000	12,000,000
Property and equipment, net						37,000,000	36,000,000
Operating lease assets, net						36,000,000	36,000,000
Goodwill						176,000,000	176,000,000
Trademarks						76,000,000	76,000,000
Other intangibles, net						157,000,000	156,000,000
Allowance for reduction of assets held for sale (a)	[2]					(52,000,000)	(22,000,000)
Total assets classified as held for sale						683,000,000	750,000,000
Liabilities [Abstract]
Accounts payable						49,000,000	53,000,000
Securitization obligations						162,000,000	206,000,000
Current portion of operating lease liabilities						5,000,000	6,000,000
Accrued expenses and other current liabilities						51,000,000	62,000,000
Long-term operating lease liabilities						28,000,000	29,000,000
Total liabilities classified as held for sale						295,000,000	356,000,000
Securitization obligation
Liabilities [Abstract]
Interest Expense, Debt				$ 2,000,000
Securitization obligation | Cartus Relocation Services
Liabilities [Abstract]
Other Secured Financings						162,000,000	206,000,000
Relocation receivables and other related relocation assets that collateralize securitization obligations						$ 172,000,000	200,000,000
Interest Expense, Debt			$ 2,000,000
Weighted average interest rate, securitization obligations				4.40%	3.80%	3.80%
Apple Ridge Funding LLC | Securitization obligation | Cartus Relocation Services
Liabilities [Abstract]
Other Secured Financings						$ 153,000,000	195,000,000
Total capacity, securitization obligations						250,000,000
Debt Instrument, Unused Borrowing Capacity, Amount						97,000,000
Cartus Financing Limited | Securitization obligation | Cartus Relocation Services
Liabilities [Abstract]
Other Secured Financings						9,000,000	$ 11,000,000
Debt Instrument, Unused Borrowing Capacity, Amount						$ 10,000,000
Cartus Financing Limited | Securitization obligation | Working Capital Facility | Cartus Relocation Services
Liabilities [Abstract]
Total capacity, securitization obligations | £					£ 5
Cartus Financing Limited | Securitization obligation | Revolving Credit Facility | Cartus Relocation Services
Liabilities [Abstract]
Total capacity, securitization obligations | £					£ 10

[1] Adjustment to record assets and liabilities held for sale at the lower of carrying value or fair value less any costs to sell based on the estimated net purchase price.

[2] Adjustment to record assets and liabilities held for sale at the lower of carrying value or fair value less any costs to sell based on the Purchase Agreement.