Aetna Inc. Chief Executive Ronald A. Williams got $3.14 million in compensation for 2008 and was awarded stock rights that could be worth an additional $10 million, the company disclosed. The compensation information was reported in the proxy filing for Aetna's annual shareholders meeting May 29.The proxy said Williams' compensation was based in part on Aetna's "superior operating performance" and his leadership in differentiating the company from its competitors by launching new products and services and expanding health information technology.