At least PM (pre-merge), the Marriott policy for all walks (includes non-Marriott Rewards members) was that the hotel had to provide the following:
- Find a comparable hotel/room near you.
- Pay for the first night (i.e .free to you.)
- If needed, pay to get you to the new hotel.
- If needed, provide a phone to notify friends/family/co-workers/etc of the hotel change.
Marriott Rewards members (depending on elite level) would get more benefits depending on their elite level. I haven't been walked in years. So I do not know if the above has changed or not. It might be worth ping'ing one of the
Marriott Bonvoy Lurkers to provide some clarification on if the above has changed and if so, what are the current walk rules.