Basis of Presentation (Details) shares in Millions, $ in Millions |
3 Months Ended | ||
|---|---|---|---|
|
Dec. 29, 2017
shares
|
Mar. 31, 2018
USD ($)
|
Mar. 31, 2017
USD ($)
|
|
| 1.75% Exchangeable Senior Debentures due 2046 | |||
| Debt instrument interest rate | 1.75% | ||
| Additional Paid-In Capital | |||
| Reclassification | $ 3,530 | ||
| HSNi | |||
| Business Acquisition, Percentage of Voting Interests Acquired | 62.00% | ||
| HSNi | QVC Group | |||
| Business Acquisition Equity Interests Issued or Issuable Number Of Shares Issued Per Shares Acquired | 1.65 | ||
| HSNi | QVC Group | Common Class A | |||
| Stock Issued During Period Shares Acquisitions] | shares | 53.6 | ||
| LMC | |||
| Related Party Transaction, Amounts of Transaction | $ 3 | $ 3 | |