Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Liberty
Dec. 31, 2012
Liberty
Income Tax Disclosure [Line Items]        
Income tax expense $ (62) $ (82)    
Effective income tax rate 36.90% 37.10%    
United States Federal Statutory Tax Rate 35.00%      
Current tax payments due to related parties     $ 56 $ 70