Basis of Presentation (Details) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Dec. 31, 2018 |
Jun. 30, 2019
USD ($)
|
Jun. 30, 2018
USD ($)
|
Jun. 30, 2019
USD ($)
|
Jun. 30, 2018
USD ($)
|
Mar. 09, 2018
item
|
|
| Basic of presentation | ||||||
| Number Of Tracking Stock | item | 2 | |||||
| LMC | ||||||
| Basic of presentation | ||||||
| Related Party Transaction, Amounts of Transaction | $ 1 | $ 2 | $ 3 | $ 4 | ||
| GCI Liberty | ||||||
| Basic of presentation | ||||||
| Tax sharing payable | 82 | 82 | ||||
| Retained Earnings | ||||||
| Basic of presentation | ||||||
| Reclassification | $ (68) | $ (255) | (265) | $ (3,785) | ||
| Liberty Ventures common stock | Common Class A | ||||||
| Basic of presentation | ||||||
| Share exchange ratio | 1 | |||||
| Liberty Ventures common stock | Common Class B | ||||||
| Basic of presentation | ||||||
| Share exchange ratio | 1 | |||||
| Transfer to entity under common control | QVC Group | ||||||
| Basic of presentation | ||||||
| Ownership interest transferred | 100 | |||||
| Reclassification Of Working Capital Categories In Operating Activities Of Statement Of Cash Flows | ||||||
| Basic of presentation | ||||||
| Reclassification of prior period immaterial error | $ 281 | |||||