Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.05  
Options granted   2.7
Weighted average grant-date fair value of options   $ 8.38
Stock-based compensation, vesting period (in years)   4
Total unrecognized compensation cost related to unvested Liberty equity awards $ 97 $ 97
Weighted average period of recognition related to unvested Liberty equity awards (in years)   2.6