Line 1a on Form 1116 would be your foreign income. It would likely consist of Interest, dividends, capital gains, self-employment or other income. All of those would likely involve reporting on a Form 1099, although not necessarily. So, the reference to Form 1099 is not absolute, it is only a suggestion of how the income may have been reported to you.
The foreign income and associated tax would be entered in the Deductions and Credits section of TurboTax, then Estimated and Other Taxes Paid, then Foreign Taxes. It may also be the result of foreign taxes reported in prior years whose unused portion is transferred into the current year.
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