Is the word ideias the same in Brazilian and European Portuguese?

Yes

The spelling, meaning, and grammatical function of "ideias" are identical in both Brazilian and Continental Portuguese. Following the 1990 Orthographic Agreement, the acute accent was removed from both versions (previously idéia), so the spelling is now uniform. The only difference is pronunciation: Brazilian Portuguese tends to have more open, clearly articulated vowels and a more syllable-timed rhythm, whereas Continental Portuguese often reduces unstressed vowels, making the word sound more "clipped" or "closed" to a Brazilian ear.

Brazilian Portuguese Examples

1. Eu tive uma ideia maravilhosa! (I had a wonderful idea!)
2. Você tem alguma ideia de como resolver isso? (Do you have any idea how to solve this?)
3. Essas ideias são muito legais para o nosso projeto. (These ideas are very cool for our project.)
4. Ele sempre traz ideias novas para a reunião. (He always brings new ideas to the meeting.)
5. Não tive ideia do que ele estava falando. (I had no idea what he was talking about.)

Portuguese (Continental) Examples

1. Tive uma ideia gira! (I had a cool idea!)
2. Tens alguma ideia de como resolver isto? (Do you have any idea how to solve this?)
3. Estas ideias são muito boas para o nosso projeto. (These ideas are very good for our project.)
4. Ele traz sempre ideias novas para a reunião. (He always brings new ideas to the meeting.)
5. Não tive ideia do que ele estava a dizer. (I had no idea what he was saying.)