I have totally different experience with Pie. My battery in idle is now great. You have to tell us more about your usage. Do you use wifi calling? Do you have low energy scan for nearby devices enabled?
What specifically do you need to know about my usage?
I use the camera fairly frequently throughout the day for work, and also use Google Keep for note taking. I listen to podcasts during my commute, approx 60 min/day. I browse the internet with Chrome, and check Twitter and Email regularly throughout the day. I may watch YouTube or use Spotify from time to time, but only at home over my wifi connection.
I'd say I'm as much a typical user as anyone -- nothing out of the ordinary.
Today I'm working from home, barely on my phone, and I've dropped to 63% since 7am (~6hrs ago). And I've received a flurry of notifications telling me to check my apps for background use, and when I tap that notification it takes me to this list of apps that are waking up frequently, some of which I literally have not opened in months.
When I check out Battery under Device Care, the biggest user for today is Google Play services, active for 5hr 51min, 10.6%. Next highest user is Podcast Player, active for 13 minutes, 8.4%.
Again, super solid phone prior to the Pie/One update, but it's been just terrible since. I have not done a full factory reset yet, but I guess that's probably my next move.