Does Al-Q'uran possess guidance in sufficient details for human beings?

Verses 111 of Chapter 12:

Indeed in their stories, there is a lesson for men of understanding. It (the Qur'an) is not a forged statement but a confirmation of that which was before it and a detailed explanation of everything and a guide and a mercy for the people who believe.

Verse 89 of Chapter 16:

And on the Day when We resurrect a witness from each nation from among themselves, and We bring you (O Muhammad) as a witness against these. And We have revealed the Book (the Qur'an) to you as an explanation of everything, a guidance, a mercy, and good news for the Muslims.

Verse 89 of Chapter 17:

And indeed We have fully explained to mankind, in this Qur'an, every kind of similitude, but most of mankind refuse (the truth and accept nothing) but disbelief. 

Verse 54 of Chapter 18:

We have devised different ways in the Qur'an to make the people understand its Message, but man is by nature very contentious.