The question title really says it all. I have Googled the subject but not found the answer!
closed as off-topic by mplungjan, Rory Alsop, FumbleFingers, aedia λ, tchrist♦ Aug 1 '14 at 15:12
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions that can be answered using commonly-available references are off-topic. A list of these references can be found here: List of general references" – mplungjan, Rory Alsop, FumbleFingers, tchrist
You can never use as greater as because greater is a comparative. It is always greater than (or just greater if the comparison subject is omitted or mentioned before).
Therefore, the right construction is the second one: as great as (or, in this case, as great a detail as).
"In as greater detail as possible" is definitely wrong, as @Gorpik explained, but "In as great a detail as possible" also sounds slightly clumsy to me. I'd go with "in as much detail as possible" or maybe "with the greatest possible detail".