Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Narrative) (Details)

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Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of Intangible Assets $ 196 $ 109 $ 388 $ 217