Investments In Affiliates Accounted For Using The Equity Method (Summary of Carrying Amount and Percentage Ownership of Significant Investments in Affiliates) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 204	$ 309
FTD
Schedule of Equity Method Investments [Line Items]
Percentage ownership	37.00%
Market value	$ 37
Equity Method Investments	67	73
LendingTree
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		115
Other
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 137	$ 121