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
Mar. 31, 2012
Mar. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expense for intangible assets with finite useful lives $ 108 $ 110