You are correct. "Did you have any idea that John was married?" means "Did you know that John was married?"
"Did you have any idea..." is more emphatic while "Did you know..." is a simple question.
2018年8月25日
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I'm sorry, my English is bad.
"Did you have any idea?" <<<this sentence means what?
2018年8月25日
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I don't understand which sentence you are asking about.