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Commitments and Contingencies (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments      
Total rent expense for operating leases $ 468us-gaap_OperatingLeasesRentExpenseNet $ 303us-gaap_OperatingLeasesRentExpenseNet $ 252us-gaap_OperatingLeasesRentExpenseNet
Minimum      
Commitments      
Term of programming contracts 1 year    
Maximum      
Commitments      
Term of programming contracts 10 years