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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Aug. 09, 2012
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Jun. 24, 2010
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May 01, 2007
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Dec. 31, 2000
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Dec. 31, 2012
Minimum [Member]
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Dec. 31, 2012
Maximum [Member]
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Dec. 31, 2012
Interactive Group [Member]
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Dec. 31, 2012
Interactive Group [Member]
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Dec. 31, 2012
Ventures Group [Member]
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Dec. 31, 2012
Ventures Group [Member]
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Dec. 31, 2011
Ventures Group [Member]
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Dec. 31, 2012
TripAdvisor, Inc. [Member]
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Dec. 04, 2012
Unvested Option Exchange [Member]
Interactive Group [Member]
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Dec. 04, 2012
Unvested Option Exchange [Member]
Ventures Group [Member]
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Dec. 04, 2012
Unvested Option Exchange Incremental [Member]
Interactive Group [Member]
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Dec. 04, 2012
Unvested Option Exchange Incremental [Member]
Ventures Group [Member]
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Dec. 31, 2012
Option Exchange [Member]
Interactive Group [Member]
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Dec. 31, 2012
Option Exchange [Member]
Ventures Group [Member]
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Dec. 31, 2012
Option Exchange [Member]
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| Stockholders' Equity Note, Stock Split, Conversion Ratio | 0.05 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | Ìý | Ìý | Ìý | Ìý | 50,000,000 | 42,900,000 | 7,300,000 | 7,800,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Options granted | Ìý | Ìý | 6,200,000 | 10,600,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 20,100,000 | 3,413,000 | 900,000 | 36,000 | Ìý | 3,700,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 1 year 3 months 19 days | 9 years | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Weighted average grant-date fair value of options | Ìý | Ìý | $ 7.32 | $ 7.11 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 7.15 | $ 8.44 | $ 26.58 | $ 27.29 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Weighted average period of recognition related to unvested Liberty equity awards (in years) | Ìý | 1 year 8 months 12 days | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 3 years | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Dividend rate to estimate fair value | Ìý | 0.00% | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Total unrecognized compensation cost related to unvested Liberty equity awards | Ìý | $ 170 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 60 | $ 55 | $ 7 | $ 54 | $ 10 | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 17 | Ìý | 4 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value | Ìý | 339 | 33 | 23 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 242 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 2,200,000 | 2,200,000 | 100,000 | 100,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 4,600,000 | 300,000 | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 13.13 | $ 13.13 | $ 4.82 | $ 4.82 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | Ìý | $ 12 | $ 14 | $ 10 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | $ 58.49 | Ìý | $ 20.36 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 1,155,000 | 1,155,000 | 0 | 8,700,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 449,000 | 449,000 | Ìý | 3,300,000 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |