Separation Adjustments And Transactions With Former Parent And Subsidiaries (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Total liabilities	$ 6,603	$ 6,499
Tax liabilities assumed	40
Previously sold businesses of Cendant assumed	4
Other contingent and corporate liabilities assumed	3
Guarantee amount over contingent liability assumed	2
Current due to former Parent and subsidiaries	19	47
Long-term due to former Parent and subsidiaries	28	30
Other current liabilities	690	619
Due from former Parent and subsidiaries	2	4
Separation of Business [Member]
Liabilities assumed	49	78
Total liabilities	49
Guarantees [Member]
Other current liabilities	2
Standby Letters of Credit [Member] | Realogy [Member]
Standby letter of credit	$ 100
Cendant [Member]
Responsible liability for separation agreement	37.50%
Realogy [Member]
Responsible liability for separation agreement	62.50%