This isn't exactly following your request, but here goes.
3 IDP is for all countries. You don't need separate ones.
How long are you going to be gone? Some of these will not be needed unless you are going to be gone a long time. Examples of things we don't do for our 4+ week trips are numbers:
4 (because there's almost nothing in them before we leave),
6 (because it's such a bother to turn it back on due to the various water-related appliances that have to recover from that),
7 (because we are in the desert and don't have anything to maintain),
9 (because we have things recorded while we are gone),
10 (because we use the phones in Europe),
13 (because we never do that when we're home).
1 You can have mail held only for 30 days, unless you have them box it up and send it to someone for you. The former is free, the latter has a charge.
6 We don't turn off the water. We do lower the temperature on the hot water heater and turn the water re-circulation system to once a day. We leave the water softener running as well as the water purifier. We should, but rarely remember to, turn off the water to the washer.
8 Don't forget the ATM/Debit card companies.
14 Leave on any night lights you may have on when you are home. Ours have light sensors and come on when it's dark and turn off when it's light. We always have some other lights on timers, but the timing does get messed up if there is a long (rare for us) power outage.
12 We are lucky in that the Sheriff will send a deputy to check on the house while we are gone. If you have a local law enforcement agency that does anything like that, use them, but be sure to tell them about anyone who might also be coming by and anyone who has a key in case of an emergency.
11 Your neighbors also need to know if someone, including law enforcement, is coming by to check on things and what their vehicle is.
10 And that brings me to the lack of cell phone service. Whoever you have help you out needs to know how to contact you in an emergency. Email isn't as immediate, but would be a decent alternative if you don't want to have a phone.
Ultimately, we try to make the place look like as much like it does when we are home as possible with the least amount of effort on our parts, and not like anything has been done special because we are gone. It is a long list to check off to look "normal."