Which movie is “pie in the sky” from?

The clip at the top of this page is from Spielberg (2017).

Spielberg: I really wanted my childhood to be sort of the pie-in-the-sky, Norman Rockwell American Dream.

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pie in the sky

In Spielberg (2017), one line is: “Spielberg: I really wanted my childhood to be sort of the pie-in-the-sky, Norman Rockwell American Dream.”

an event that sb talks about that seems very unlikely to happen

くだけた · 2 本の映画に登場

an event that sb talks about that seems very unlikely to happen
This talk of moving to Australia is all just pie in the sky.

定義：Oxford Advanced Learner's Dictionary 第 9 版