Sorry! You got it wrong and reversed....
Let's say when the Euro was strong in the past, the rate was 1.3, which means = 1 Euro$ = US$1.3.
Now Euro is weak. Let's say the rate will be 1.0, which means = 1 Euro$ = US$1.0
Using the above numbers as an example, if Apple has Euro$100 billions cash, if would exchange into US$ 130 billions in the past. Now the Euro is weak, the same Euro$100 billions would exchange into US$100 billions, US$30 billions less than before. Worse yet, Apple product would cost more in Europe. This could also happen with the Chinese Yuan BUT fortunately, the Chinese money is tied (float) very closely with the US money.
The borrowed EURO$ part is positive for Apple though.