Document And Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Jan. 31, 2013 Interactive Group [Member] Series A [Member]	Jan. 31, 2013 Interactive Group [Member] Series B [Member]	Jan. 31, 2013 Ventures Group [Member] Series A [Member]	Jan. 31, 2013 Ventures Group [Member] Series B [Member]
Entity Registrant Name	Liberty Interactive Corporation
Entity Central Index Key	0001355096
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding			512,746,754	28,921,353	35,337,916	1,444,308
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$ 9.1