Investments In Affiliates Accounted For Using The Equity Method (Summary of Share Earnings (Losses) of Affiliates) (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 29, 2017 |
|
| Schedule of Equity Method Investments [Line Items] | |||
| Share of earnings (losses) of affiliates, net (note 9) | $ (14) | $ (27) | |
| HSNi | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Share of earnings (losses) of affiliates, net (note 9) | 16 | ||
| FTD | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Share of earnings (losses) of affiliates, net (note 9) | (8) | (5) | |
| LendingTree | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Share of earnings (losses) of affiliates, net (note 9) | 2 | ||
| Other | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Share of earnings (losses) of affiliates, net (note 9) | $ (6) | $ (40) | |
| HSNi | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Business Acquisition, Percentage of Voting Interests Acquired | 62.00% | ||