Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation (Narrative) (Details)

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Basis Of Presentation (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2013
Lease Agreements [Member]
Jan. 18, 2013
Noncontrolling Interest [Member]
Jan. 18, 2013
SIRIUS XM [Member]
Mar. 31, 2013
SIRIUS XM [Member]
Mar. 31, 2012
SIRIUS XM [Member]
Jan. 18, 2013
FCC licences [Member]
SIRIUS XM [Member]
Mar. 31, 2012
Pro Forma [Member]
Dec. 31, 2012
Pro Forma [Member]
SIRIUS XM [Member]
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination             $ 10,372,000,000          
Business Acquisition, Cost of Acquired Entity, Other Noncash Consideration             253,000,000          
Revenue, Net 789,000,000 35,000,000           729,000,000 0   838,000,000  
Assets, Current 3,458,000,000   2,211,000,000                 4,039,000,000
ownership percentage acquired             50.00%          
Related Party Costs 4,000,000 3,000,000                    
Related Party Transaction, Amounts of Transaction         3,000,000              
Purchase of shares in equity method investee             50,000,000          
Business Acquisition, Cost of Acquired Entity, Cash Paid             161,000,000          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value           10,286,000,000 10,841,000,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net             21,466,000,000          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain             7,500,000,000          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value             10,215,000,000          
Preferred Stock, Par or Stated Value Per Share $ 0.01   $ 0.01       $ 0.001          
Convertible Preferred Stock, Shares Issued upon Conversion             1,293,509,076          
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents             569,000,000          
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables             210,000,000          
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment             1,700,000,000          
Business Acquisition, Purchase Price Allocation, Goodwill Amount             14,015,000,000          
Business Acquisition, Purchase Price Allocation, Intangible Assets Not Amortizable             930,000,000     8,600,000,000    
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets             945,000,000          
Business Acquisition, Purchase Price Allocation, Current Assets, Prepaid Expense and Other Assets             480,000,000          
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities, Long-term Debt             (2,490,000,000)          
Business Acquisition, Purchase Price Allocation, Current Liabilities, Deferred Revenue             (1,565,000,000)          
Business Acquisition, Purchase Price Allocation, Other Liabilities             (1,025,000,000)          
Business Acquisition, Purchase Price Allocation, Deferred Taxes Asset (Liability), Net, Noncurrent             (903,000,000)          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles             21,466,000,000          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners             50.00%          
Equity Method Investments 870,000,000   3,341,000,000         281,000,000       855,000,000
Property, Plant and Equipment, Net 1,783,000,000   157,000,000                 1,857,000,000
Indefinite Lived Intangible Assets Total 23,889,000,000   344,000,000                 23,889,000,000
Finite-Lived Intangible Assets, Net 1,039,000,000   108,000,000 108,000,000               1,028,000,000
Other Assets, Noncurrent 91,000,000   32,000,000                 1,974,000,000
Assets 32,396,000,000   8,325,000,000         28,067,000,000       33,642,000,000
Long-term Debt 2,419,000,000   0                 2,486,000,000
Deferred Tax Liabilities, Net                       2,939,000,000
Other Liabilities                       3,890,000,000
Stockholders' Equity Attributable to Noncontrolling Interest 10,474,000,000   (8,000,000)                 10,833,000,000
Operating Income (Loss) 160,000,000 (32,000,000)                 146,000,000  
Interest Expense 11,000,000 3,000,000                 (57,000,000)  
Income (Loss) from Equity Method Investments 17,000,000 12,000,000                 (21,000,000)  
Net Income (Loss) Attributable to Noncontrolling Interest 48,000,000 1,000,000                 45,000,000  
Net Income (Loss) Attributable to Parent 8,062,000,000 150,000,000                 116,000,000  
Earnings Per Share, Basic                     $ 0.96  
Earnings Per Share, Diluted                     $ 0.93  
Stockholders' Equity Attributable to Parent $ 14,277,000,000   $ 6,440,000,000                 $ 13,494,000,000