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Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets Intangible Assets (Goodwill) (Details)

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Intangible Assets Intangible Assets (Goodwill) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Goodwill [Line Items] Ìý Ìý
Goodwill $ 14,389 $ 14,365
Goodwill, Acquired During Period 24 [1] Ìý
SIRIUS XM
 Ìý Ìý
Goodwill [Line Items] Ìý Ìý
Goodwill 14,164 14,165
Goodwill, Acquired During Period (1) [1] Ìý
Other Goodwill
 Ìý Ìý
Goodwill [Line Items] Ìý Ìý
Goodwill 225 200
Goodwill, Acquired During Period $ 25 [1] Ìý
[1] TruePosition made an acquisition during the six months ended June 30, 2014.