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 |