Just found out if you plug your iPhone X into a Macbook Pro by using USB-C to Lightning Cable. It will do the same fast charging as the 29W USB-C Power Adapter... will return the 29W Adapter but keep the cable.
Here is what I found on the Macbook Pro Thunderbolt 3 Page:
Charging devices
Thunderbolt 3 ports can also supply power to attached devices.
MacBook Pro (15-inch, 2016) and MacBook (13-inch, 2016, Four Thunderbolt 3 Ports) can power two devices that use up to 15 watts, and two more devices that use up to 7.5 watts. It doesn't matter which side of your MacBook Pro that they're connected to—power is delivered on a first-come, first-served basis.
MacBook Pro (13-inch, 2016, Two Thunderbolt 3 Ports) can power one device that uses up to 15 watts and one device that uses up to 7.5 watts.
Here is what I found on the Macbook Pro Thunderbolt 3 Page:
Charging devices
Thunderbolt 3 ports can also supply power to attached devices.
MacBook Pro (15-inch, 2016) and MacBook (13-inch, 2016, Four Thunderbolt 3 Ports) can power two devices that use up to 15 watts, and two more devices that use up to 7.5 watts. It doesn't matter which side of your MacBook Pro that they're connected to—power is delivered on a first-come, first-served basis.
MacBook Pro (13-inch, 2016, Two Thunderbolt 3 Ports) can power one device that uses up to 15 watts and one device that uses up to 7.5 watts.
