Feb 17 (Reuters) - Aetna Inc
* Aetna board of directors doubles quarterly cash dividend, authorizes additional share repurchases
* Sets quarterly cash dividend of $0.50 per share
* Board authorized company to repurchase up to an additional $4 billion of its common stock.
* New authorization is in addition to approximately $1.1 billion of repurchase authority remaining under company's existing share repurchase programs Source text for Eikon: Further company coverage: