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This question already has an answer here:

私は帰国することに決めた

This is the original sentence, but shouldn't it be:

私は帰国することを決めた

or

私は帰国することが決めた?

marked as duplicate by ajsmart, Eiríkr Útlendi, Blavius, l'électeur grammar Aug 15 '18 at 23:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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ことに決める{きめる} is a structure that means, by itself "to decide". You'd use を with the verb 決める{きめる} if you refer to choosing a noun.

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