This excerpt taken from the CVS 10-K filed Feb 27, 2007.
Goodwill ~ The Company accounts for goodwill and intangibles under Statement of Financial Accounting Standards (SFAS) No. 142, Goodwill and Other Intangible Assets. As such, goodwill and other indefinite-lived assets are not amortized, but are subject to impairment reviews annually, or more frequently if necessary. See Note 3 for further information on goodwill.