Actually, the detail of the Trinity is in the Bible!
18* g Then Jesus approached and said to them, “All power in heaven and on earth has been given to me.
19h Go, therefore,* and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the holy Spirit,
20i teaching them to observe all that I have commanded you.* And behold, I am with you always, until the end of the age.”
Yes, I know. I said the concept is there but the word is not.