USB Power Delivery is able to work over USB Type A/B cables which are specifically designed to support it.
Since the USB Type C was designed much later, I am curious. Do all USB Type C cables support USB PD by default? And do they support a certain level, or the full 100W?
Related: Does USB Power Delivery handle USB cables that are not PD-aware?
Answer
Yes they are assuming they are certified by the USB group. It is noted in the USB PD 1.0 presentation that it is "compatible with USB 2.0 and 3.0 cables" so they should be fine. The USB-PD spec confirms they are compatible assuming they are spec-compliant. 
The USB Type-C mechanical/electrical standard dictates the connector and the physical pinout of the connector. USB-PD doesn't alter any of that but rather is an extension of the USB Type-C protocol.
What you'll most likely see in the future is microcontrollers coming out with USB Type-C support/engines that may or may not include the USB-PD extension standard.
Give this article a read, it should help out
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