Form 1116, line 3e, is what my original question was really about. I have since looked at past years, and the number that TurboTax enters is always much higher ...
What you specify is not what TurboTax is using. It is on the order of 50% over that and does not seem to be any reasonable function of other numbers in the retu...
So if I am using 2022 1099-DIV for my estimates, and only boxes 1a and 1b had entries, then I would subtract box 1b from 1a to get the amount of dividends to pu...