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Patents (Tables)
 3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Intangible Assets

The following table summarizes intangible assets (in millions):

Amortizable intangible assets:March 31, 2013December 31, 2012
Carrying
Amount		Accumulated
Amortization		Carrying
Amount		Accumulated
Amortization
Patents
$
6,746
(5,183)
$
6,746
$
(5,091)