Short And Long-Term Debt Indebtedness Table (Details) £ in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2022 USD ($)		Mar. 31, 2021 USD ($)	May 02, 2022 USD ($)	Mar. 31, 2022 GBP (£)	Jan. 10, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 GBP (£)	Jun. 02, 2021 USD ($)	Jan. 27, 2021 USD ($)
Principal Amount
Long-term debt principal amount		$ 2,941
Securitization obligations		105						$ 118
Unamortized Discount (Premium) and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		30
Net Amount
Outstanding borrowings, long-term debt		2,911
Securitization obligations		$ 105						118
LIBOR
Net Amount
Description of variable interest rate basis		LIBOR
ABR
Net Amount
Description of variable interest rate basis		ABR
Secured Debt | Extended Term Loan A
Principal Amount
Long-term debt principal amount		$ 231						232			$ 237
Unamortized Discount (Premium) and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[1],[2],[3]	1
Net Amount
Outstanding borrowings, long-term debt		$ 230	[1],[2],[3]					231
Secured Debt | Extended Term Loan A | June 2021 to March 2022
Net Amount
Quarterly percentage of original principal amount for quarterly amortization payments		0.625%				0.625%
Secured Debt | Extended Term Loan A | June 2022 to March 2023
Net Amount
Quarterly percentage of original principal amount for quarterly amortization payments		1.25%				1.25%
Secured Debt | Extended Term Loan A | June 2023 to March 2024
Net Amount
Quarterly percentage of original principal amount for quarterly amortization payments		1.875%				1.875%
Secured Debt | Extended Term Loan A | June 2024 and thereafter
Net Amount
Quarterly percentage of original principal amount for quarterly amortization payments		2.50%				2.50%
Secured Debt | Extended Term Loan A | LIBOR | Less than 2.00 to 1.00
Net Amount
Debt Instrument, Basis Spread on Variable Rate		1.75%
Secured Debt | Extended Term Loan A | ABR | Less than 2.00 to 1.00
Net Amount
Debt Instrument, Basis Spread on Variable Rate		0.75%
Senior Notes | 4.875% Senior Notes
Principal Amount
Long-term debt principal amount		$ 407						407
Unamortized Discount (Premium) and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		1
Net Amount
Outstanding borrowings, long-term debt		$ 406						406
Interest Rate		4.875%				4.875%
Senior Notes | 5.75% Senior Notes
Principal Amount
Long-term debt principal amount		$ 900						900
Unamortized Discount (Premium) and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		1
Net Amount
Outstanding borrowings, long-term debt		$ 899						898
Interest Rate		5.75%				5.75%
Senior Notes | 5.25% Senior Notes
Principal Amount
Long-term debt principal amount		$ 1,000					$ 1,000	0
Unamortized Discount (Premium) and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[4]	17
Net Amount
Outstanding borrowings, long-term debt		$ 983	[4]					0
Interest Rate		5.25%				5.25%
Convertible Debt | 0.25% Exchangeable Senior Notes
Principal Amount
Long-term debt principal amount		$ 403						403		$ 403
Unamortized Discount (Premium) and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[5]	10
Net Amount
Outstanding borrowings, long-term debt		$ 393	[5]					328		$ 319
Interest Rate		0.25%				0.25%
Line of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding		$ 0	[1],[3],[6]					0
Net Amount
Outstanding borrowings, short-term debt, line of credit facility		0	[1],[3],[6]					0
Line of credit facility outstanding		$ 0	[1],[3],[6]					0
Line of Credit | Revolving Credit Facility | LIBOR | Less than 2.00 to 1.00
Net Amount
Debt Instrument, Basis Spread on Variable Rate		1.75%
Line of Credit | Revolving Credit Facility | ABR | Less than 2.00 to 1.00
Net Amount
Debt Instrument, Basis Spread on Variable Rate		0.75%
Line of Credit | Non-extended Revolving Credit Commitment
Net Amount
Total capacity, short-term debt, line of credit facility		$ 477
Line of Credit | Extended Revolving Credit Commitment
Net Amount
Total capacity, short-term debt, line of credit facility		948
Securitization obligation
Unamortized Discount (Premium) and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		0
Net Amount
Relocation receivables and other related relocation assets that collateralize securitization obligations		157						132
Interest Expense, Debt		$ 1		$ 1
Weighted average interest rate, securitization obligations		3.20%		3.90%		3.20%
Securitization obligation | Apple Ridge Funding LLC
Principal Amount
Securitization obligations		$ 104	[7],[8]					116
Net Amount
Securitization obligations		104	[7],[8]					116
Total capacity, securitization obligations		200
Debt Instrument, Unused Borrowing Capacity, Amount		96
Securitization obligation | Cartus Financing Limited
Principal Amount
Securitization obligations		1	[8],[9]					2
Net Amount
Securitization obligations		1	[8],[9]					$ 2
Total capacity, securitization obligations		20
Debt Instrument, Unused Borrowing Capacity, Amount		19
Securitization obligation | Cartus Financing Limited | Revolving Credit Facility
Net Amount
Total capacity, securitization obligations | £						£ 2			£ 5
Securitization obligation | Cartus Financing Limited | Working Capital Facility
Net Amount
Total capacity, securitization obligations | £						5
Securitization obligation | Cartus Financing Limited | Maximum Capacity | Revolving Credit Facility
Net Amount
Total capacity, securitization obligations | £						£ 10
Letter of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding		42
Net Amount
Outstanding borrowings, short-term debt, line of credit facility		42
Line of credit facility outstanding		$ 42
Subsequent Event | Line of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding					$ 0
Net Amount
Outstanding borrowings, short-term debt, line of credit facility					0
Line of credit facility outstanding					0
Subsequent Event | Letter of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding					42
Net Amount
Outstanding borrowings, short-term debt, line of credit facility					42
Line of credit facility outstanding					$ 42

[1] Interest rates with respect to revolving loans under the Revolving Credit Facility and outstanding borrowings under the Extended Term Loan A at March 31, 2022 are based on, at the Company's option, (a) adjusted London Interbank Offering Rate ("LIBOR") plus an additional margin or (b) JP Morgan Chase Bank, N.A.'s prime rate ("ABR") plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter's senior secured leverage ratio, the LIBOR margin was 1.75% and the ABR margin was 0.75% for the three months ended March 31, 2022.

[2] The Extended Term Loan A has quarterly amortization payments equal to a percentage per quarter of the original principal amount of $237 million, as follows: 0.625% per quarter from June 30, 2021 to March 31, 2022; 1.25% per quarter from June 30, 2022 to March 31, 2023; 1.875% per quarter from June 30, 2023 to March 31, 2024; and 2.50% per quarter for periods ending on or after June 30, 2024, with the balance of the Extended Term Loan A due at maturity on February 8, 2025.

[3] The maturity date of the Non-Extended Revolving Credit Commitment under the Revolving Credit Facility is February 2023. The maturity date of each of the Extended Revolving Credit Commitment and Extended Term Loan A may spring forward to March 2, 2023 if on or before March 2, 2023, the 4.875% Senior Notes have not been extended, refinanced or replaced to have a maturity date after May 10, 2025 (or are not otherwise discharged, defeased or repaid by March 2, 2023).

[4] In the first quarter of 2022, the Company issued $1,000 million aggregate principal amount of 5.25% Senior Notes due 2030 and used net proceeds, together with cash on hand, to redeem in full both the outstanding 9.375% Senior Notes due 2027 and the 7.625% Senior Secured Second Lien Notes due 2025. See below under the header "5.25% Senior Notes Issuance and Redemption of 9.375% Senior Notes and 7.625% Senior Secured Second Lien Notes" for a description of these transactions.

[5] See below under the header "Exchangeable Senior Notes" for additional information and Note 1, "Basis of Presentation—Recently Adopted Accounting Pronouncements", related to the January 1, 2022 adoption of the new standard on "Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity".

[6] The Revolving Credit Facility includes available capacity under the Non-extended Revolving Credit Commitment of $477 million and available capacity under the Extended Revolving Credit Commitment of $948 million. As of March 31, 2022, there were no outstanding borrowings under the Revolving Credit Facility and $42 million of outstanding undrawn letters of credit. On May 2, 2022, the Company had no outstanding borrowings under the Revolving Credit Facility and $42 million of outstanding undrawn letters of credit.

[7] As of March 31, 2022, the Company had $200 million of borrowing capacity under the Apple Ridge Funding LLC securitization program with $104 million being utilized leaving $96 million of available capacity.

[8] Available capacity is subject to maintaining sufficient relocation related assets to collateralize these securitization obligations. Certain of the funds that Realogy Group receives from relocation receivables and related assets are required to be utilized to repay securitization obligations. These obligations are collateralized by $157 million and $132 million of underlying relocation receivables and other related relocation assets at March 31, 2022 and December 31, 2021, respectively. Substantially all relocation related assets are realized in less than twelve months from the transaction date. Accordingly, all of Realogy Group's securitization obligations are classified as current in the accompanying Condensed Consolidated Balance Sheets. Interest incurred in connection with borrowings under these facilities amounted to $1 million for both the three months ended March 31, 2022 and 2021. This interest is recorded within net revenues in the accompanying Condensed Consolidated Statements of Operations as related borrowings are utilized to fund Realogy Group's relocation operations where interest is generally earned on such assets. These securitization obligations represent floating rate debt for which the average weighted interest rate was 3.2% and 3.9% for the three months ended March 31, 2022 and 2021, respectively.

[9] In January 2022, the program was amended and the revolving loan facility was reduced from £5 million to £2 million. As of March 31, 2022, Realogy Group has, through a special purpose entity known as Cartus Financing Limited, agreements providing for a £2 million revolving loan facility (with the ability to increase up to £10 million) and a £5 million working capital facility. As of March 31, 2022, the Company had $20 million of borrowing capacity under the Cartus Financing Limited securitization program with $1 million being utilized leaving $19 million of available capacity.