Basis of Presentation (Details) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
|
Jul. 22, 2016
shares
|
May 18, 2016
USD ($)
$ / shares
|
Sep. 30, 2017
USD ($)
|
Sep. 30, 2016
USD ($)
|
Sep. 30, 2017
USD ($)
|
Sep. 30, 2016
USD ($)
|
Dec. 31, 2016
USD ($)
|
Nov. 04, 2016
USD ($)
|
Nov. 02, 2016
USD ($)
|
|
| Investments in and Advances to Affiliates, at Fair Value | Ìý | Ìý | $ 4,068 | Ìý | $ 4,068 | Ìý | $ 3,161 | Ìý | Ìý |
| Liberty Expedia Holdings | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Cash distributed to Liberty from Liberty Expedia Holdings | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 299 | Ìý |
| Additional Paid-In Capital | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Reclassification | Ìý | Ìý | Ìý | Ìý | $ 405 | Ìý | Ìý | Ìý | Ìý |
| Liberty Broadband | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Ownership Interest In Investee | Ìý | Ìý | 23.00% | Ìý | 23.00% | Ìý | Ìý | Ìý | Ìý |
| Investments in and Advances to Affiliates, at Fair Value | Ìý | $ 2,400 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Liberty Ventures common stock | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Investments in and Advances to Affiliates, at Fair Value | Ìý | Ìý | $ 4,068 | Ìý | $ 4,068 | Ìý | Ìý | Ìý | Ìý |
| Price per share of Liberty Broadband Series C common stock | $ / shares | Ìý | $ 56.23 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Liberty Ventures common stock | Liberty Broadband | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Liberty Broadband investment in Charter stock | Ìý | $ 5,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Liberty Ventures common stock | Common Class A | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Spilt-Off redemption ratio | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 0.4 | Ìý |
| Liberty Ventures common stock | Common Class B | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Spilt-Off redemption ratio | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 0.4 | Ìý |
| CommerceHub | Common Class A | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Shares issued as dividend | shares | 0.1 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| CommerceHub | Common Class B | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Shares issued as dividend | shares | 0.1 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| CommerceHub | Common Class C | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Shares issued as dividend | shares | 0.2 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Liberty Expedia Holdings | Common Class A | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Spilt-Off redemption ratio | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 0.4 | Ìý |
| Liberty Expedia Holdings | Common Class B | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Spilt-Off redemption ratio | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 0.4 | Ìý |
| Liberty Expedia Holdings | Spinoff | Expedia Holdings Margin Loan | Liberty Expedia Holdings | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Principal amount | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 350 |
| Corporate and Other | Liberty Ventures common stock | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Investments in and Advances to Affiliates, at Fair Value | Ìý | Ìý | 4,068 | Ìý | 4,068 | Ìý | Ìý | Ìý | Ìý |
| LMC | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Related Party Transaction, Amounts of Transaction | Ìý | Ìý | $ 3 | $ 2 | $ 8 | $ 8 | Ìý | Ìý | Ìý |
| Charter | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share exchange ratio | Ìý | 1 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |