...+ U.S. pharmacy services and drugstore retailer CVS Health Corp. has announced that it intends to purchase health insurance provider Aetna Inc. for about $69 billion, the majority of which will be funded with debt. + CVS expects the transaction to close in the second half of 2018, subject to shareholder and regulatory approvals. + In our view, CVS' financial risk profile will weaken considerably as a result of the significant increase in debt, given the scale of the acquisition as well as execution risks that could affect operating performance. + We are placing our '###+' long-term ratings on CVS and its debt on CreditWatch negative and affirming our 'A-2' short-term ratings. + We intend to resolve the CreditWatch, likely by lowering the corporate credit rating on CVS by one notch, when more information regarding the transaction and financing becomes available. NEW YORK (S&P Global Ratings) Dec. 4, 2017--S&P Global Ratings said today that it has placed its '###+' long-term corporate credit...