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Short And Long-Term Debt Loss on the Early Extinguishment of Debt (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Debt Disclosure [Abstract]        
Loss on the early extinguishment of debt [1] $ 0 $ 0 $ 4 $ 0
[1] Includes a net benefit of $11 million of former parent legacy items and an $8 million expense related to the settlement of the Strader legal matter in Corporate and Other, and $2 million of restructuring charges as follows: $1 million in the Company Owned Real Estate Brokerage Services segment and $1 million in the Real Estate Franchise Services segment for the three months ended June 30, 2017.