Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

v2.4.0.6
Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Goodwill $ 14,215 $ 200
Goodwill, Acquired During Period 14,015  
SIRIUS XM [Member]
   
Goodwill [Line Items]    
Goodwill 14,015 0
Goodwill, Acquired During Period 14,015 [1]  
ANLBC [Member]
   
Goodwill [Line Items]    
Goodwill 180 180
Goodwill, Acquired During Period 0  
Other Goodwill [Member]
   
Goodwill [Line Items]    
Goodwill $ 20 $ 20
Minimum [Member]
   
Goodwill [Line Items]    
Finite-Lived Intangible Asset, Useful Life 6 years  
[1] The increase to SIRIUS XM goodwill was the result of the acquisition of a controlling interest in SIRIUS XM in January 2013, see note 1 for further discussion.