I think, does this page need to be updated to reflect that iPhone 12 (or later) are supported with 18W USB-C power adapter? I am also wondering if iPhone 12 etc. actually comes with a 20W USB-C power adapter. I need to know because I’m in desperate need of charging my Macbook Pro and I can’t locate its original power adapter.
The iPhone 12 does not ship with a power adapter, only a lightning-to-USB-C cable. Regardless, a 20 W adapter will not charge a MacBook Pro, you need the 61 W or 96 W charger.
Find the right power adapter and cable for your Mac notebook - Apple Support