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Goodwill And Other Intangible Assets
9 Months Ended
Sep. 30, 2011
Goodwill And Other Intangible Assets 
Goodwill And Other Intangible Assets
11.      Goodwill and Other Intangible Assets

The carrying amount of goodwill by segment for the nine months ended September 30, 2011 is as follows (in millions):

Corning's gross goodwill balances for the periods ended September 30, 2011 and December 31, 2010 were $7.1 billion and $7.0 billion, respectively.  Accumulated impairment losses were $6.5 billion for the periods ended September 30, 2011 and December 31, 2010, and were generated entirely through goodwill impairments related to the Telecommunications segment.

Other intangible assets are as follows (in millions):

Amortized intangible assets are primarily related to the Telecommunications and Life Sciences segments.

Amortization expense related to these intangible assets is estimated to be $14 million for 2011 and $16 million thereafter.