You are correct, you should not enter this information twice. Report your foreign dividends in the 1099-DIV section of TurboTax, even if you do not have a 1099-DIV tax document. You can include the foreign taxes paid in this section as well. TurboTax will then carry over the information to Form 1116, where you will answer more questions about the foreign taxes paid when you revisit that part of your return.
For additional information, see TurboTaxMargaretL's excellent response to a similar question by clicking the link below.
https://ttlc.intuit.com/replies/5269596