If youre picky about your USB accessories (like me), you may check if its approved by Google software engineer Besnon Leung. He has some good news about the new Pixel 2 and 2 XL they support up to 27W charging!
For that you will need to buy a compatible USB Power Delivery charger. The phones ship with an 18W charger (same as the original Pixels) that promises 7 hours of mixed usage with just 15 minutes of charge.
Imaging how much more youll get out of a 27W charger! If you get the new Pixelbook, it comes with a 45W charger that is compatible (at a lower power level, of course). Google is selling this charger separately for $60, though you can check Leungs list for other appropriate chargers (off brand chargers could damage your device… your $650/800 device!).
PS. Apparently since v8.0 Oreo, Android is using the Type-C Port Manager of the Linux kernel. It seems that this feature will support Alternate Mode, which will be great for docks (i.e. providing video out while charging).